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LA GRAMMATICA DI ENGLISH GRATIS IN VERSIONE MOBILE   INFORMATIVA PRIVACY

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                                                                                         ESERCIZI :   Serie 1 - 2 - 3  - 4 - 5  SERVIZI:   Pronunciatore di inglese - Dizionario - Convertitore IPA/UK - IPA/US - Convertitore di valute in lire ed euro                                              

 

 

WIKIBOOKS
DISPONIBILI
?????????

ART
- Great Painters
BUSINESS&LAW
- Accounting
- Fundamentals of Law
- Marketing
- Shorthand
CARS
- Concept Cars
GAMES&SPORT
- Videogames
- The World of Sports

COMPUTER TECHNOLOGY
- Blogs
- Free Software
- Google
- My Computer

- PHP Language and Applications
- Wikipedia
- Windows Vista

EDUCATION
- Education
LITERATURE
- Masterpieces of English Literature
LINGUISTICS
- American English

- English Dictionaries
- The English Language

MEDICINE
- Medical Emergencies
- The Theory of Memory
MUSIC&DANCE
- The Beatles
- Dances
- Microphones
- Musical Notation
- Music Instruments
SCIENCE
- Batteries
- Nanotechnology
LIFESTYLE
- Cosmetics
- Diets
- Vegetarianism and Veganism
TRADITIONS
- Christmas Traditions
NATURE
- Animals

- Fruits And Vegetables



ARTICLES IN THE BOOK

  1. AdSense
  2. AdWords
  3. Allinanchor command
  4. AutoLink
  5. BigTable
  6. Blogger
  7. CustomizeGoogle
  8. Deep link
  9. Egosurfing
  10. ElgooG
  11. Eric E. Schmidt
  12. Features of Gmail
  13. French military victories
  14. Froogle
  15. Gmail
  16. GMail Drive
  17. GmailFS
  18. Gmail Mobile
  19. Goobuntu
  20. Google
  21. Google.org
  22. Google Alerts
  23. Google Analytics
  24. Google and privacy issues
  25. Google Answers
  26. Googlebait
  27. Google Base
  28. Google bomb
  29. Google Book Search
  30. Googlebot
  31. Google Browser Sync
  32. Google Calendar
  33. Google Checkout
  34. Google China
  35. Google Code
  36. Google Code Search
  37. Google consultant
  38. Google Current
  39. Google Desktop
  40. Google Docs Spreadsheets
  41. Google Earth
  42. Google economy
  43. Googlefight
  44. Google File System
  45. Google Finance
  46. Google Foundation
  47. Google Founders' Award
  48. Google generation
  49. Google Groups
  50. Google Hacking
  51. Google Hacks
  52. Google Image Labeler
  53. Google Image Search
  54. 302 Google Jacking
  55. Google juice
  56. Google Labs
  57. Google Language Tools
  58. Google logo
  59. Google Maps
  60. Google News
  61. Google Notebook
  62. Google Pack
  63. Google Page Creator
  64. Google PC
  65. Googlepedia
  66. Google platform
  67. Googleplex
  68. Google Reader
  69. Google Scholar
  70. Google search
  71. Google Search Appliance
  72. Googleshare
  73. Google's hoaxes
  74. Google Summer of Code
  75. Google Talk
  76. Googletestad
  77. Google Toolbar
  78. Google Trends
  79. Google Video
  80. Google Video Marketplace
  81. Google Watch
  82. Google Web Accelerator
  83. Google Webmaster Tools
  84. Googlewhack
  85. Google WiFi
  86. Google X
  87. Googlism
  88. GTalkr
  89. Hello
  90. Hilltop algorithm
  91. History of Gmail
  92. History of Google
  93. I'm Feeling Lucky
  94. Joga Bonito
  95. Keyhole Markup Language
  96. Lawrence E. Page
  97. Link farm
  98. List of acquisitions by Google
  99. List of Google products
  100. MapReduce
  101. Measure Map
  102. Mediabot
  103. Mobile GMaps
  104. Orkut
  105. PageRank
  106. PhpGmailDrive
  107. Picasa
  108. Political Google bombs
  109. PR0
  110. Project 02
  111. Pyra Labs
  112. RoamDrive
  113. Schnitzelmitkartoffelsalat
  114. Scraper site
  115. Scroogle
  116. Search engine optimization
  117. SEO contest
  118. Sergey Brin
  119. Urchin Software Corporation
  120. Web traffic
  121. YouTube

 

 
CONDIZIONI DI USO DI QUESTO SITO
L'utente può utilizzare il nostro sito solo se comprende e accetta quanto segue:

  • Le risorse linguistiche gratuite presentate in questo sito si possono utilizzare esclusivamente per uso personale e non commerciale con tassativa esclusione di ogni condivisione comunque effettuata. Tutti i diritti sono riservati. La riproduzione anche parziale è vietata senza autorizzazione scritta.
  • Il nome del sito EnglishGratis è esclusivamente un marchio e un nome di dominio internet che fa riferimento alla disponibilità sul sito di un numero molto elevato di risorse gratuite e non implica dunque alcuna promessa di gratuità relativamente a prodotti e servizi nostri o di terze parti pubblicizzati a mezzo banner e link, o contrassegnati chiaramente come prodotti a pagamento (anche ma non solo con la menzione "Annuncio pubblicitario"), o comunque menzionati nelle pagine del sito ma non disponibili sulle pagine pubbliche, non protette da password, del sito stesso.
  • La pubblicità di terze parti è in questo momento affidata al servizio Google AdSense che sceglie secondo automatismi di carattere algoritmico gli annunci di terze parti che compariranno sul nostro sito e sui quali non abbiamo alcun modo di influire. Non siamo quindi responsabili del contenuto di questi annunci e delle eventuali affermazioni o promesse che in essi vengono fatte!
  • L'utente, inoltre, accetta di tenerci indenni da qualsiasi tipo di responsabilità per l'uso - ed eventuali conseguenze di esso - degli esercizi e delle informazioni linguistiche e grammaticali contenute sul siti. Le risposte grammaticali sono infatti improntate ad un criterio di praticità e pragmaticità più che ad una completezza ed esaustività che finirebbe per frastornare, per l'eccesso di informazione fornita, il nostro utente. La segnalazione di eventuali errori è gradita e darà luogo ad una immediata rettifica.

     

    ENGLISHGRATIS.COM è un sito personale di
    Roberto Casiraghi e Crystal Jones
    email: robertocasiraghi at iol punto it

    Roberto Casiraghi           
    INFORMATIVA SULLA PRIVACY              Crystal Jones


    Siti amici:  Lonweb Daisy Stories English4Life Scuolitalia
    Sito segnalato da INGLESE.IT

 
 



THE WORLD OF GOOGLE
This article is from:
http://en.wikipedia.org/wiki/Link_farm

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

Link farm

From Wikipedia, the free encyclopedia

 

On the World Wide Web, a link farm is any group of web pages that all hyperlink to every other page in the group. Although some link farms can be created by hand, most are created through automated programs and services. A link farm is a form of spamming the index of a search engine (sometimes called spamexing or spamdexing). Other link exchange systems are designed to allow individual websites to selectively exchange links with other relevant websites and are not considered a form of spamdexing.

History

Link farms were developed by search engine optimizers in 1999 to take advantage of the Inktomi search engine's dependence upon link popularity. Although link popularity is used by some search engines to help establish a ranking order for search results, the Inktomi engine at the time maintained two indexes. Search results were produced from the primary index which was limited to approximately 100,000,000 listings. Pages with few inbound links continually fell out of the Inktomi index on a monthly basis.

Inktomi was targeted for manipulation through link farms because it was then used by several independent but popular search engines, such as HotBot. Yahoo!, then the most popular search service, also used Inktomi results to supplement its directory search feature. The link farms helped stabilize listings for (normally) online business Web sites that had few natural links from larger, more stable sites in the Inktomi index.

Link farm exchanges were at first handled on an informal basis, but several service companies were founded to provide automated registration, categorization, and link page updates to member Web sites.

When the Google search engine became popular, search engine optimizers learned that Google's ranking algorithm depended in part on a link weighting scheme called PageRank. Rather than simply count all inbound links equally, the PageRank algorithm determines that some links may be more valuable than others, and therefore assigns them more weight than others. Link farming was adapted to help increase the PageRank of member pages.

However, even the link farms became susceptible to manipulation by unscrupulous Webmasters who joined the services, received inbound linkage, and then found ways to hide their outbound links or to avoid posting any links on their sites at all. Link farm managers had to implement quality controls and monitor member compliance with their rules to ensure fairness.

Alternative link farm products emerged, particularly link-finding software that identified potential reciprocal link partners, sent them template-based emails offering to exchange links, and create directory-like link pages for Web sites hoping to build their link popularity and PageRank.

Search engines countered the link farm movement by identifying specific attributes associated with link farm pages and filtering those pages from indexing and search results. In some cases, entire domains were removed from the search engine indexes in order to prevent them from influencing search results.

Justification

The justification for link farm-influenced crawling diminished proportionately as the search engines expanded their capacities to index more sites. Once the 500,000,000 listing threshold was crossed, link farms became unnecessary for helping sites stay in primary indexes. Inktomi's technology, now a part of Yahoo!, now indexes billions of Web pages and uses them to offer its search results.

Where link weighting is still believed by some Webmasters to influence search engine results with Google, Yahoo!, MSN, and Ask (among others), link farms remain a popular tool for increasing PageRank or perceived equivalent values. PageRank-like measurements apply only to the individual pages being linked to (typically the reciprocal linking pages on member sites), so these pages must in turn link out to other pages (such as the main index pages of the member sites) in order for the link weighting to help.

The expression "link farm" is now considered to be pejorative and derogatory. Many reciprocal link management service operators tout the value of their resource management and direct networking relationship building. The reciprocal link management services promote their industry as an alternative to search engines for finding and attracting visitors to Web sites. Their acceptance is by no means universal but the link management services seem to have established a stable customer base.

Guidelines

Search engines such as Google recommend that webmasters request relevant links to their sites (conduct a link campaign), but avoid participating in link farms. According to Google, a site that participates in a link farm may have its search rankings penalized.

See also

  • 302 Google Jacking
  • Cloaking
  • Doorway pages
  • Keyword stuffing
  • Link campaign
  • Link doping
  • Reciprocal link
  • Scraper site
  • Server farm
  • Spam in blogs
  • Spamexing
  • Web guide
  • Web ring

External links

  • Google Information for Webmasters
  • Yahoo!'s Search Content Quality Guidelines
  • MSN Guidelines for Successful Indexing
Retrieved from "http://en.wikipedia.org/wiki/Link_farm"