Are there any torrent sites exclusive for .3gp or .mp4 videos?

Are there any torrent sites exclusive for .3gp or .mp4 videos?

thanks.

i think is
ipodnova

What is 3gp? I've seen it on some torrent sites I belong to but I'm not sure what it is.

I usually make my own mp4 files but it would be nice to have shorter, smaller downloads.