I have a friend who we used to be close. Unfortunately she has moved away to another continent so our contact is now via email and facebook.
We have both had a fairly rough year or so. She has lost a parent and I have lost a parent too. When she lost her parent i sent her a private message expressing my sympathy etc. I received nothing except a round robin after my loss. I replied with a personal email updating her on my situation. (Thinking she may not have noticed post) Nothing back.
Its the same with birthdays I always post a Happy Birthday mess. I receive none and neither does anyone get a thank you.
Petty I know but I think this is selfish.