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I entered Google+ when it was invite only and I realized there was nothing of interest there, just a bunch of my internet friend sharing youtube videos, I "deleted" G+ about the time Google Reader (R.I.P.) integrate it for sharing and I'd never looked back. Sad, because invite-only-G+, had a beautiful minimal interface but the feed and motivation to share wasn't there.
I adopted early and abandoned early as well.
I honestly didn't mind it per se, it was just a ghost town. I may go back to it someday if there is content I like, combined with a social graph that respects my distaste for knowing about every meaningless detail of every family/friend/acquaintance's daily life. I think that the problem is that the measure of a social network's success is the amount of 'chatter' on it. It is this chatter that I dislike, as it is mostly irrelevant, not interesting, and time wasting. I guess I don't like successful social networks by definition...