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Nobody can say for sure yet, but I doubt it'll be around very much longer.

If you're looking for a check-in API, Foursquare's seems like the best bet at this point. The Venues (ie. places) Platform is especially good, with rate limits starting at 5,000/hr: https://developer.foursquare.com/overview/venues.html

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[Disclosure: I work at Factual]

There are other good APIs to consider as well: Google Places, Factual, Yelp, etc. Each API has its own pros and cons in terms of query limits, terms and restrictions, fees, etc.

This is a good starting place for research: http://www.quora.com/What-are-the-pros-and-cons-of-each-Plac...

You could also check out Fwix's API.

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