Ladies (and I'm sure the gents as well), in the last week I have received invitations from two different providers to link to them on LinkedIn, a professional networking site, but the invitation came from their real-life civilian identities.
LinkedIn, Facebook, Twitter, etc give you the option to upload your contact list from Outlook, Yahoo, Gmail, etc, allowing the site to look for matching addresses already registered, and to hook you up with people you know already on the site. It works great, in fact, too good. If there isn't a match, these sites (in this case LinkedIn) emails ALL the addresses and invites you to create an account to link to the person inviting you, thus increasing their membership.
I have received two invites to my hobby email to do just this. I happen to have a professional account on the site, so I logged into it and searched these names to see who in the hell is mixing professional life with my hobby email. Turns out in both cases, I knew them as providers. Now I am seeing their REAL NAMES and PROFESSIONAL RESUMES. I've notified them both via hobby channels, and they have no idea of my professional identity, but everybody they had in their contact list may now know theirs.
If you were careless enough to mix hobby and civilian contacts, you stand a great chance of this happening to you. Be careful damn it!