The Loose Leaf app lets you create and share your doodles.
The Togethera app lets you create distinct social media circles, so you can connect with who you want, when you want.
Check-in apps are a dime a dozen, but they usually are a little limited. Cheers encourages users to share not only the places they love, but the people and things as well.
Tunetug allows pretty much anyone with a smartphone to access the party playlist and tug for or against a song.
Qwiqq is a user generated deal sharing app.