fyi...information posted online is THE WORST place to keep a secret. Google, YouTube, Craigslist, telephone company...sure, they ask you to link the accounts together, but the fact is, since they "can" link them, they'll do so--with or without your permission. They just won't release the linking.
Yeah, right. We all know how well secrets are kept...just ask the gov't about how many intel leaks they've had...

Seriously, though...yeah, the moment you post something, even just text, it's possible someone you know will say..."You know...that sounds a lot like Fred...wonder if it is? I know! I'll send an anonymous email to Fred, so he doesn't know its me...and ask. If it is, fishing expedition was successful! If not, this person will just delete the email, no harm done."
So...future reference, if you get an email asking, just don't reply to it. If it is someone you know, give them time to grow some hairy little balls and ask you to your face.