Me thinks you are missing out on a big LBS contender.. Rummble - http://www.rummble.com.

Recently, the app has launched on Android, WindowsPhone, and has a brand new verison of its iPhone app live. Not to mention its functionality isn't like any of the ones you have mentioned above, the fact that is personalises content based on my own tastes and trust with others.

Or why not mention its recent dive into the Twitter world, allowing me to see the latest happenings in my neighborhood or around the world based on anyone's Tweet - all datamined through Rummble!

I'm really impressed with its progress and personally think it is one to keep you eye on..