facebook restriction

Hi,
i have a problem, i have some viral apps...2 day ago i pushed traffic, and instantly users grow to 400 online, then the traffic drops to 100 online and till today i have an average of 100,(not more, not less...100 stable). I have my own server and i don't understand why i've this problem, a week ago with some other apps i had an average of 3k online. Now I've changed name domain, change apps, but the traffic doesn't grow. Do you know if facebook makes some sort of restriction on server ip? Or do you have some idea to solve my problem?
thanks

I wonder if your server bandwidth is over ? I had such problem few weeks back when my online users didn't increase more than 500 inspite of me sending so much traffic.
I changed my server and it was good again.

No, my bandwidth is 10tb and i've used only 330gb this month.

is facebook disabling spammy apps?