GroupMe, the popular group-texting service, has hit the Marketplace.  The WP7 version, which was the second-most requested platform by users, was actually spear-headed by an intern HackNY's Summer Fellows Program.

Using a data connection and/or texting, GroupMe allows users to create different user groups.  Any time a member of the group sends a message, the other members will be notified.  In addition, GroupMe assigns each group a common phone number, so any single member can start conference calls on the fly.  And while you can use this snazzy app to communicate with your friends through GroupMe, it is not necessary.  Any phone that can text can create groups and get started.  Best of all, the service, just like the app, is free.

The current iteration only supports the group messaging, chat and conference calling, but more features, such as location tracking and photo sharing are expected to follow in the near future.  The startup has gained a fast following, and has even gotten the attention of celebs, like Paris Hilton, who recently tapped them as her go-to forum for viewers of her upcoming show on cable network Oxygen.

Get GroupMe here.

Source: GroupMe