Ever since I read Sophie Kinsella's book I've Got Your Number, I feel rude and churlish if I don't end my text messages with either a smile emoticon or hugges-and-kisses xoxoxo's. I never would have thought of it before the main character scolded someone for not using them. Now I almost always use them for my family, at least. It's like my signature sign off.
My daughter read the book - she's a huge fan, just like me - so she does it too! And the other one picked it up from us. We're very warm in my family. : )