If I understand you right you want to block the hosts which offer such fakes? This works only if they are using fixed IP addresses, normally only companies have fixed IPs. People that don´t use fixed IP and are spamming are only blocked until they reconnect, a dynamic IP changes every time you connect. This would mean the next time you would block an other user who is using this IP.

To make it short there aren´t good solutions at the moment you can filter it out like LOTR suggested, you can also limit the file size this helps if you are looking for videos which are usually huge. Or live with the fakes - ignoring helps.

Morgwen