Naveen Selvadurai, co-founder of Foursquare is leaving the location-based check-in app developer. Selvadurai will still remain on Foursquare's board as an advisor but won't be actively involved and isn't sure of his next endeavour, at least, that's what he says.

He wrote in a personal blog post to announce his departure. Here's Foursquare's comment on the news:

When Naveen and Dennis launched foursquare at SXSW 2009, they had a few hundred beta testers. Now, as we approach our third birthday, we have a community of over 15 million that has checked in over 1.5 billion times. This wouldn’t have been possible without Naveen’s creativity, vision, and tireless work. We’re sad to see him go, but excited to see what he builds next. We can’t thank him enough for everything he’s done to make foursquare what it is today.
What will he be building next?