I thought about it. But it gets creepier. Former colleagues in different geographical locations who don't have my phone number/contact info but are only connected on linkedin appear in Facebook.
Does your company funnel every location through the same internet connection? And some people put their employer's name on Facebook. They could be determining from your colleagues in close proximity which company you work for and then connect you with any others they are aware of. Still creepy but perhaps not as scary.