Here’s a tip:
Post a Happy Birthday on someone’s Facebook timeline:
1. Pick a joke that reminds you of your friend.
2. Copy the URL. (Which you could also paste in an email.)
3. Go to your friend’s Facebook timeline and paste the URL. Facebook will create a thumbnail and some extra text.
4. Click once in the extra text and delete it. (Seen highlighted above.)
5. Replace the title URL with a message like “Happy Birthday!”
That’s it!