Thanks a lot for your help, friend. It really helps. I read the guide too.
Sophos has a good Facebook security guide which is well worth a read: Sophos Facebook Best Practices
Also, if your OS is either Vista or Windows 7, the next version of Flash will include a sandbox for Firefox: Flash 11.3 includes Protected Mode for Firefox Unfortunately though, Protected Mode won't be available for Windows XP users.
It's currently in its third BETA stage if you want to give it a go: Flash 11.3 BETA
If I come across a fix for your problem though, I'll add it to this thread.
Also, if you could help me with my previous question...
BTW, I'm not really connected to any other computers and sharing files with them so I'm not really in a network. I use cable broadband and have my firewall setting as public for it. So, how much really is the risk if I start using an http(non-secure, unencrypted) connection for facebook. And would it really matter? Since before facebook introduced this feature, I and everyone else used an unencrypted http connection, no?