Fair. But I've also witnessed this outside of work environments. People are so strongly (and as I say, this isn't bad on its own) tied to past relationships (HS, college) and easily connected to them via FB, Twitter, etc. that they aren't making relationships in their new locations when they move. The latter part is the problem. You're in a new environment. You're working and living with new people. You need to connect to them in some manner, if you remain strangers with those around you (work, neighborhood, etc.), then you will be lonely and unhappily disconnected from people unless you're particularly introverted.