I'd say no, with the exception of Google+ which in the future Google might use as a ranking factor.
However for social interaction, don't look at it as a ranking factor more of a way to interact with your customers and build a customer base that doesn't rely on search engines. Especially in the current climate with all these Google updates hurting rankings.
If you have a good Social channel, you can still succeed.
I Seomoz did a study recently and found FB shares (not likes) to be the most relevant relation to top ranking. But that could also be explained because the top ranking gave the most visibility to be shared.
I have not seen it improve my rankings, but I have seen it improve my sales, no evil eye. I post regularly in a non-spammy way. I post about how I make my products, about new things I am developing, and about personal stuff, like a trip to a local state park with photos. I even post political remarks. IMO, people want to know that there is a human being on the other side of the transaction--at least, in my niche they do. It builds trust and trust is what business is all about. And it's just more enjoyable for them and for me.