Why was my signature modified?

[Tyco]

Yes, I do understand that it did break some sort of rule, but I am entirely unsure what rule I broke. I read the rules and didn't see anything I violated except advertising (It was my Youtube channel, what's so bad about that?) Here is the EXACT signature I had before it got changed, please tell me why it was.
----------------------------
Full-time n00b of MCSG
Youtuber who gave up his old channel and moved to a new one

http://www.youtube.com/user/ZachsGameStack/ < This ad isn't block by adblock
No videos, yet...

 

[MaxtheSwain]

awesome meme :3

 

[Ninga]

it's too big, and it spams up the forums. Need to have less amount of lines of text for a start.

 

[Tyco]

O

it's too big, and it spams up the forums. Need to have less amount of lines of text for a start.

hkay, thanks man

 

[MattZeeX]

*Casually whistles

 

[branone]

Question answered, thread locked.