Google

Google reportedly uses when an article is retweeted or referenced in Twitter as a signal in organic and news rankings (even though links on Twitter are nofollowed). They also use it to enhance the news universal results (based on how many people share an article).

Google “computes and uses author quality” for when someone tweets. When Sullivan asked if they calculate whether a link should carry more weight depending on who tweets it, Google Responded, “Yes we do use this as a signal, especially in the ‘Top links’ section [of Google Realtime Search]. Author authority is independent of PageRank, but it is currently only used in limited situations in ordinary web search.”

Google says it treats links shared on Facebook Fan pages the same way as tweeted links, but they have no personal Facebook wall data. Authority for Facebook Pages is also treated like Twitter.

So, the more authoritative the crowd sharing links to your content, the better. Not that different than PageRank.

Bing

When it comes to Twitter, Bing tells Sullivan it also looks at social authority of users and more specifically, looks at how many people they follow and how many follow them, adding that this can add “a little weight” to a listing in regular search results (though it carries more in Bing’s separate Social Search). Bing decides when links should carry more weight based on the person who tweets it.

As far as Facebook, Bing currently looks at links shared on Facebook that are marked as being shared to “everyone” and those from Fan Pages. “We can tell if something is of quality on Facbook by leveraging Twitter,” as Sullivan paraphrases Bing’s response. “If the same link is shared in both places, it’s more likely to be legitimate.”

Bing does not use its new Facebook data in ordinary web search…yet.

So, clearly it pays to tweet and build a credible Twitter presence. This means gaining a significant following in number, but also getting authoritative users to follow you (and hopefully retweet your links). This would appear to be good for plain old fashioned organic rankings as well as other supplemental search results. More importantly, it pays to create good content that will attract authoritative Twitterers to share it with others.

These things of course pay anyway, but it’s nice to know that they actually do have an effect on search rankings as well.

It’s not surprising that Twitter is currently playing a more important role in to search engine ranking than Facebook, simply because Twitter is public by default. Facebook is much more walled, meaning that most of the good Facebook data is private. Though it will be interesting to see what happens when Bing does integrate its newly acquired Facebook into its regular search offerings.

This wall of Facebook’s is also a factor into why Facebook could potentially unleash its own legitimate search engine. It’s got a search feature now of course, but there is a great deal of potential for them to do a whole lot more and really get under Google’s skin. More on that here.

Sullivan provides more background and context around the search engines’ social signals, as well as the full with both Bing and Google, and details about the Twitter Firehose’s lack of nofollow.

Written by Chris Crum