Great article we found on a highly esteemed site in the SEO community, www.seomoz.org
“As of yesterday, both Bing and Google have confirmed (via an excellent interview by Danny Sullivan) that links shared through Twitter and Facebook have a direct impact on rankings (in addition to the positive second-order effects they may have on the link graph). This has long been suspected by SEOs (in fact, many of us posited it was happening as of November of last year following Google + Bing’s announcements of partnerships with Twitter), but getting this official confirmation is a substantive step forward.
In addition to that revelation, another piece of critical data came via yesterday’s announcement:
Danny Sullivan: If an article is retweeted or referenced much in Twitter, do you count that as a signal outside of finding any non-nofollowed links that may naturally result from it?
Bing: We do look at the social authority of a user. We look at how many people you follow, how many follow you, and this can add a little weight to a listing in regular search results. It carries much more weight in Bing Social Search, where tweets from more authoritative people will flow to the top when best match relevancy is used.
Google: Yes, we do use it as a signal. It is used as a signal in our organic and news rankings. We also use it to enhance our news universal by marking how many people shared an article.
Danny Sullivan: Do you try to calculate the authority of someone who tweets that might be assigned to their Twitter page. Do you try to “know,” if you will, who they are?
Bing: Yes. We do calculate the authority of someone who tweets. For known public figures or publishers, we do associate them with who they are. (For example, query for Danny Sullivan)
Google: Yes we do compute and use author quality. We don’t know who anyone is in real life 🙂
Danny Sullivan: Do you calculate whether a link should carry more weight depending on the person who tweets it?
Google: 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.
We now know that those link sharing activities on Twitter + Facebook are evaluated based on the person/entity sharing them through a score Google calls “Author Authority,” and Bing calls “Social Authority.”
We can probably predict a lot of the signals the search engines care about when it comes to social sharing; some of my guesses include:
We can probably also take a stab at some of the signals Google + Bing use for Author/Social Authority in the context of the sharing/tweeting source:
These signals represent my opinions only, and while it’s very likely that at least some are being used, it’s even more likely that there are many more that aren’t listed above. Over time, hopefully we’ll discover more about the impact of social sharing on web rankings and how we can best combine SEO + social media marketing.
To me, the most exciting part about this is the potential to reduce webspam and return to a more purely editorial model. While people often link to, read and enjoy sources that link out manipulatively, very few of us will be likely to follow a Twitter account, friend someone on Facebook, or “like” something in a social site that’s inauthentic, manipulative or spammy. The social graph isn’t necessarily cleaner, but the complexity of spam is far lower.
Here’s to the evolution of organic marketing – search, social, content, blogs, links – it’s all coming together faster than ever before, and that’s a very good thing for holisticly minded web marketers.”