The mobile messaging landscape is set for another shakeup following GroupMe. Some of these applications only allow users to communicate if they both are signed up for the service – such as Facebook and Google – but they still offer a great outlet for communicating on mobile devices without incurring the fees of texting.

Skype’s acquisition of GroupMe, and the anticipated integration of Skype into Window’s mobile operating system with Microsoft’s purchase of Skype, will likely bridge the gap between OS-specific messaging services and third-party outlets. Others, including RIM’s market-leading BBM service, will have to work hard to outpace the growth potential of the combined force of Skype’s video capabilities with the mobile group messaging power of GroupMe.