The official Google Maps app has been updated again, this time with a major addition to Latitude - check-ins. Just as Hotpot seemed to be a Yelp-killer, Google must now have Foursquare in its sights, because Latitude's check-ins have a few major advantages over Foursquare and its competitors.
Latitude will notify you when it recognizes your location, giving you the option to check-in wherever you are. However, you can also set up automatic check-ins for only the places you want, an incredibly convenient feature that still covers any privacy concerns. Whether you check-in manually or automatically, you will be checked-out once you leave (another feature Foursquare users have been asking for).
And the final nail in the coffin for Foursquare? Check-in at one location enough times and you'll become a "Regular," then "VIP," and finally "Guru." And the fact that Google tells us that Latitude currently has ten million active users pretty much guarantees Latitude's dominance in the check-in game.
Source: Google Lat-Long Blog