W.e.i.r.d.~!!

Eh guys, i'm totally weird bout my 'CHAT BOX'
U see? too many people write on it!
Who are they??
Real person ? Spammers ? Virus ?
I'm appreciate what they write..
but i'm confuse..
So guys out there please help me..
How to stop it if that are spammers or virus!
No OFFENSE!
:))