PageRank es una marca registrada y patentada por Google el 9 de enero de 1999, que ampara una familia de algoritmos utilizados para asignar de forma numérica la relevancia de los documentos (o páginas web) indexados por un motor de búsqueda. (...) El sistema PageRank es utilizado por el popular motor de búsqueda Google para ayudarle a determinar la importancia o relevancia de una página. (Wikipedia)
Los puntos son adjudicados en función de los enlaces que apuntan a esa página, de manera que a más enlaces, más puntos. Sin embargo, no todos los enlaces suman igual; una página que tiene una mayor relevancia, aporta más puntos con su enlace que otra que tiene menos PR. Incluso puede aportar más que muchas de menos relevancia juntas.
Esto suena algo enigmático porque en realidad es así. La fórmula exacta del PR es para Google como la de la Coca-Cola para esta otra marca.
Siempre que no se hagan trampas (yo te enlazo, tú me enlazas...) parece una forma bastante democrática de valorar la relevancia de un sitio. Si tienes muchos enlaces entrantes (desde otras páginas) es que presuntamente tienes información interesante en tu página y parece acertado pensar que es más relevante que otras con menos. Si además, los que generan esos enlaces son a su vez sitios relevantes, lo tuyo ya debe ser un bombazo de sitio.
El PageRank puede tomar un valor entre 0 y 10, pero este último, prácticamente está reservado para los dioses. Enesta fuente se citan las entidades que en la última actualizacion de Enero 2011 lo tenían:
- Google Search http://www.google.com/
- World Wide Web Consortium http://www.w3.org/
- US Goverment website http://www.usa.gov/
- Adobe - Adobe Reader Download http://get.adobe.com/reader/
- National Portal of India http://india.gov.in/
- United States Department of Health and Human Services http://www.dhhs.gov
- The Central People's Government of the People's Republic of China http://www.gov.cn/
- Miibeian http://www.miibeian.gov.cn/
- Adobe - Adobe Flash Player http://get.adobe.com/flashplayer/
- The White House http://www.whitehouse.gov/
- Facebook http://www.facebook.com/
- Social Bookmarking Sharing Button Widget http://www.addthis.com/bookmark.php
- CNN.com - Breaking News, U.S., World, Weather, Entertainment & Video News http://us.cnn.com/
- Europeana http://www.europeana.eu/portal/
- EUA - European University Association http://www.eua.be/
- Recovery.gov - Tracking the Money http://www.recovery.gov/
- Joomla http://www.joomla.org/
Si te interesa conocer tu PageRank, así como sus cambios (se actualiza cada cierto tiempo en un periodo que se denomina Google Dance)PageRank Alert es un servicio online, gratuito y en español, que hace eso y alguna otra cosa más.
Recientemente ha sido remozado y actualizado. Se puede utilizar sin registro, pero con él, el sistema se ocupa de enviarte un aviso a tu correo cada vez que hay un cambio en tu web. También pemite hacer listas de páginas o comprobar tu historial de PR a lo largo del tiempo.
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