Britekite has been available for the iPhone via a web app but the lack of the location based feature has kept me from using the service. Last I checked, it wasn’t available in the App Store but it should be coming soon. Here’s a list of features and a video preview:

- Auto geo-location including Place Snapping and Pick a Place
- Notifications (nearby friends, posts, friend requests, comments & mentions)
- Posting photos and notes to locations
- Nearby people and activity feed
- Friends lists and activity feed
- People, places and posts search
- Threaded messaging
- Profile streams
- Place steams
- Placemarks
- Commenting on posts