Its biggest plus is that it is cross platform. They have apps for Blackberry, Android, iOS and Symbian. So you can talk with almost anybody out there. At least

Its biggest plus is that it is cross platform. They have apps for Blackberry, Android, iOS and Symbian. So you can talk with almost anybody out there. At least in my home country, most people have Blackberry/Symbian. Imagine having a group conversation with people on different platforms and in different countries.