I can not find a single contact method on a user's profile
The focus is on community, versus the individual (in my opinion). That is why I feel that there isn't as much of an emphasis on individual interaction. I've provided my website, so people who want to get in touch with me do so through that.
I guess if you really wanted to get in touch with someone, you could comment on one of their answers or questions. Maybe offer to buy them beer :).