Similar question might have been asked before, but APIs are in constant flux and my question is quite specific.
At this point, are there any other free public real time social data APIs similar to Twitter's Streaming API?
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Try Meetup.com's streaming API: http://www.meetup.com/meetup_api/docs/stream/2/open_events/
For reference, I typed this search query in Google: "free public streaming api -twitter"