If I haven't talked to a friend in a while on Facebook, what should I write on his wall?

Domino

New member
To stay in touch with friends, what should I post on their walls? Funny video links? How are you (though this question is trite)? Got any suggestions?
Also, this is a miscellaneous question: How do I keep up with new groups on facebook? Sometimes when I go on I see that maybe 10 of my friends have joined the same group. Is it coincidence or is it because one person joined and others copied? What are some interesting groups/pages I can join so that others may follow my lead? Generally, what kinds of groups do people join-favorite movies, music, food, etc.?
 
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