MobiTwitter mobile ODP is a Twitter Mobile Client. Using this ODP users can easily post his status, view friends statuses, friends search, Add friends, Sent Direct Messages, etc as like web application
Yahoo! Koprol Koprol is a mobile community, where people have conversations based on places. Koprol has a growing directory of places where you can "check-in" and trade comments, share photos and reviews, with your friends and other people nearby. Koprol helps you discover new and exciting people and places in the world
Snaptu is a free application that includes different applications. It includes Twitter, Facebook, Flickr, News, Picasa and so on.
It is an all-in-one application which runs in full speed as well as it is efficient for the users to have this kind of application instead of having a lot of individual applications