Chirp Update: Watch Out Foursquare!

UPDATE: WATCH OUT FOURSQUARE. Williams promises a 'Points of Interest' feature,
allowing users to check-in at certain locations, and see what tweets
are occuring there. However, Williams says this is not exactly like
"checking in." "We're not looking to duplicate what Foursquare and
Gowalla are doing but rather integrate them better into the service,"
he says. "What we care about is what's happening in those places, and
not just where they are." He continues, that it's "A way to see where a...