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Google learnt from its mistakes with Google+ and is eager to not repeat themGoogle has learned nothing from their mistakes.
As evidence their real name policy is still active. Contrast with Twitter where a lot of users have fake names. And yes, you can find hateful users on Twitter and I know of some folks that have been harassed, but the community I'm active in is very professional and civilized and the conversations have a much higher quality than what I've seen on Google+ or YouTube, even with their real names. Guess some people are assholes no matter what.
Also the Google+ API is still read-only. Which means you can only use Google's official tools for posting content. There's no way for example to cross-post on both Twitter and Google+. Apps like TweetDeck aren't possible for Google+.
Oh and Google Reader is still dead.
> Google doesn't want to mess up identity again, so that wouldn't be an issue
I'm sure they don't want to mess it up, but given that they are continuously messing up identity, I'm also sure that it will be an issue.