Copeland - 11:09 pm on Feb 13, 2012 (gmt 0)
If I were writing an algorithm to index, organize, and rank the content on the web, I absolutely would include social signals and I would give that variable significant weight. Real people are sending messages about the quality and context of content. Why would anybody at Google ignore those messages when writing the algo. Ignoring social may not doom a site today but it will as time passes. Having a history of quality social signals will one day be the equivalent of having a bunch of long term dot.edu inbound links.