The purpose of social media is to share content among friends. You do well if your content is shared and interacted with, but the benefit in terms of SEO starts when people start interacting with your site, not with the social media post.
After all, when you post on Facebook you are leaving a comment on someone else's site (Zuckerberg's). If anything, you're making Facebook more popular, and not your own site.
One of these days people are going to realize Zuckerjerk didn't do much for the world except allowing mankind to share ridiculous amount of content such as pics of kittens, puppies and hamsters. Awwwww.
That doesn't have anything to do with our industry, as muffincrumbs points out. Our content doesn't go viral.
I don't think Google are counting on Plus to beat FB and Twitter. They just want to be present in the social media game and have a nice addition to some Google services.
BTW, the article Buzz linked to is about one blogger quoting another blogger slash advertiser. Just saying. "Social signals have replaced links in importance for SEO" (Merry Morud) is a ridiculous sentence.
I'd be more concerned with Google Speak, as spoken search queries will radically change the way in which Google is used. Hummingbird is all about trying to understand the context of the query and not only looking at individual words like so far. So if you want to do well, you got to adapt to that mindset.
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