When someone peppers their Facebook updates around the time they go to, and come back from work - they are 'Smartphone Cruising'.
They're looking for an excuse to pull out their new iPhone/Nexus to show off to everyone in the carriage that they have a Bleeding Edge
They have no friends, but hundreds of Facebook Friends
- so updating your status gives a 'Smartphone Cruiser' something to do with their gadget.
Usually practised by male Uber
geeks, of The Great Unwashed
variety. In the mistaken and laughable belief that women will become aroused.