It's a few years after the question, granted. I thought it might not hurt to add a comment, though, here in the knowledge web.
Though it's not per se a matter of conventional microblogging, but Apache Roller provides a conventional blogging framework and API, in Java - in a sort of superset of patterns in microblogging. FYI, documentation for Roller 5.0.1 is here - there may've been a bad link, at the site...
As far as measuring "Like" feedback, there are services such as ShareThis, such that one could integrate with Roller, at the presentation level - perhaps, using Wicket or Vaadin, at that same application level. Granted, it's not a closely integrated feedback system that would make for - may not provide a lot of close integration between the content presentation and the visitor feedback components, if one's using a local API for the content management and social service like ShareThis for the content feedback - but ShareThis, in particular, does integrate with popular social networking services, and it's available. Hope it helps!