Whoo-hoo… and whoopty-do! Looky at you!
HIP!
HIP!
HOORAH!!!
Hooray
Good Lad…keep them coming 
Slan,
D.
Ahem.
Congratulations, Congratulations!
But really, your avatar is so five minutes ago.
Nice to have you aboard though!
Carol
Congrats to you!
It wouldn’t be the same without you!
On this occasion I shall serenade you with Cliff Richard:
Congratulations
And jubilations
I want the world to know I’m happy as can be
I want the world to know
I’m happy as can be
www.lyricsfreak.com/c/cliff-richard/32099.html
rather than with Juliana Theory:
Congradulations
Today is another day
It’s coming crashing down to break you again
Congradulations
You can change
Sometimes when lying on your back
You learn to breathe again
It’s your party and you can cry if you want to but on this occasion I lean towards Cliff Richard. Funny, I never thought I’d ever say that. 
Keep 'em rolling C. 
Yay!
Actually, I have a secret to share.
I got my name from the Paul Simon song. It was playing when I registered.
I got my name from rich. Although nowadays it seems like nobody knows who rich is anymore, but that’s another story…
Congratulations.
Congratulations, congratulations, Congratulations.