Welcome back and happy birthday.
Sorry to sound like a dick but if there was a big book of forums do's and don’ts making a, I'm back thread, would be in the don't section along with an I'm gone thread. Plus you really haven't been gone that long. These kind of threads only really work for well known, well liked, been around for years and years and are leaving/come back for an actual reason, like moving to a place with no internets or something.
...but yeah, welcome back.