Specifically, there is a notification icon positioned in the top right corner of the app that displays all the activity of your friends. You’ll be notified for thing like friends commenting on your check-ins, when there are new comments or photos on a check-in you’ve commented on, when Facebook friends join Foursquare, you’re ousted as Mayor, and much more. Moreover, you’ll be alerted when specific locations start swarming so that you can join the frenzy.
Naturally, you’ll have command of what kind of notifications you want to receive so that you’re not inundated with trivial things – but more importantly, keep track of things that you care about the most. We’ve seen the Foursquare app for Windows Phone 7 being upgraded recently as well, but Android’s version can claim the new notifications system all to itself for now. Luckily, you can actually check out the new feature as well though Foursquare’s web site – though, it’s bound to arrive on other versions of the mobile app.
source: Foursquare via Mobileburn