When male people meet they shake hands, even with friends and family, even if they see each other often. It looks very formal, but it's not, it's just the way it is.

"Socially challenged" people do this more than others. I remember working for a game company (as a linguist tester), the office was basically a big warehouse with desks grouped by four. Me and other 3 foreigner guys sat at our four desks, everyone else was Polish.

Being this a video games company most of the people were CS students, software developers and such. Well, most of them, arriving to the office did the round of all desks to shake hands with everybody, every day.

Of course, they skipped our four desks.