Posterous 3.0 for iPhone "Spaces" Takes Aim at Google+ Circles

With Tumblr getting a lot of attention recently for its rapid growth, Posterous released major update to its web service and iPhone app this week. But, its target doesn’t appear to be Tumblr. It looks like the update is aimed at Google+ instead.

Woo-hoo! Introducing Posterous Spaces

Here’s the list of new features in the Tumblr 3.0 update app.

– New Reader Tab to view & comment on friend’s posts.
– New Popular Tab to discover cool Spaces worth following.

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