See, this is why FB and Twitter are so evil. If you heard someone say "3 more sleeps until your birthday" to a child you wouldn't be upset (presuming not?). How often would you hear that outside your family anyway?
But as a way to show off online and be all twee and childlike it is kind of annoying, I do see that. Delete all other people and just tweet and FB away to yourselves, it's the only way. 