Add blogspot to that list. OK - perhaps not a total failure, but just try putting a link to any blogspot blog in an email and see what happens. Blogspot's online reputation stinks (because it's been hammered by scrapers, link stuffers and outright fraudsters). It's as credible as having a Yahoo! email account.
It certainly sounds like it - clicking a G+ "like" button is supposed to be a "plus 1" vote for search and result in higher SERPS. But just like anything else contrived so far, it'll have the ring ripped out of it soon enough and become worthless too. The surest way to screw up Google+ would be to link it to a special SEO benefit. It'll go the same way as blogspot.
The key to successful social media is establishing and maintaining a healthy culture in that community. Google+ may get big, but it'll be 90% meaningless junk (or more) if there is inadequate leadership establishing a healthy culture. Trying to get the SEO crowd on board would be the
last place I'd start - it's a seriously unruly mob just looking for plunder for the most part. (Present company excluded, of course
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