I was browsing a few mobile social networks last night and came across this funny/cute flash animation on Plazes. The main character is Mario and it shows a good use case for mobile social networking, cheering Mario up.
A few days ago some of the R&D folks from The New York Times launched Shifd. It acts like a virtual repository of random bits of information that you need to access from any device that has web access. It even has a community aspect that’s unique, you can share links to different communities like Facebook, Digg, and Delicious :-). Notes and Places don’t have a simple sharing mechanism, so I’m going to have to give it a unhappy face for this 
I would definitely improve sharing of Notes and Places and also add a browser plug-in so you can highlight text or a ULR and add it to Shifd with a quick right click of the mouse.
Give a try, you can put your todo list, shopping list, as well as addresses for quick reference from your phone.
www.shifd.com
Engadget Mobile