On Facebook I found a person who I see at work once a week or so. She did respond to my request of being "friends" so I thought there might be a chance to get to know her better (she doesn't have much info in her bio). Having seen her for a couple of years now I did send her my regular e-mail address and also gave it to her in person. No word from her on Facebook or through e-mail. But I haven't brought up her non-responsiveness in person either - don't want to make her feel uncomfortable. The way I look at is I tried. Maybe someday she'll shock me and I'll hear from her other than at work.