Instead of messaging one person at a time…how about sending that message to multiple contacts at once. GroupMe makes this possible.
Currently the darling startup at SXSW, GroupMe promises to be the new social app for the iOS and Android platform and is currently available in the Android Market.
Group Messaging
Start groups with the people already in your contacts.
Send and receive messages using your data plan, or use SMS if you have a poor connection.
Share photos with your groups inline.
LocationAdd your location to any message you send.
See all group members on a map.
Conference CallingEvery group gets a unique phone number.
Any group member can call the number to start an group conference call.
Give GroupMe a go today!
iOS http://groupme.com/iphone/download
Android https://market.android.com/details?id=com.groupme.android



Check ReChat (Android chat):
- Facebook, Yahoo!®, Google Talk, Jabber/XMPP;
- group chat (Yahoo!®, Google Talk, XMPP);
- free SMS worldwide BETA (with replies for USA/Canada);
- plain/bubble view, font packs, send image/video;
Facebook features: upload image/video, send image/video, send message (as private event or wall post).
Yahoo!® features: conferences (create/invite), add/remove contacts.
Google Talk features: group chat, new email notification, unread emails w/o content.
Jabber/XMPP features: rooms (create/invite), add/remove contacts.