MobileNations is the primary name for Android Central, WPCentral, Crackberry, webOS and iMore.
Basically if you go to mobilenations.com you have the option to go to any of the 5 site above.. I my self am a long time past member of crackberry, also use imore and androidcentral. Instead of having a login for each site, you can have a passport that allows login for all 5 site..