What is GroupMe?
Free group texting and conference calling. It’s like a private chat room over SMS, or reply-all text messaging. GroupMe enables you to organize and communicate with the groups of people in your life that are important to you.
What can I do with it?
Set up unique groups to text message or conference call. Each group is given a unique phone number. When you send a text message to a GroupMe number, the message is sent instantly to everyone in the group. When you call it, GroupMe automatically connects all group members on a conference call. Because it’s a unique phone number, you can save it to your contacts and you’ll never forget who you’re talking to.
via groupme.com
This is too easy to believe! Can't wait to get the family "grouped" together.