Unblocking these websites is very easy. There are two ways to unblock social networking websites. The first one is that you should always find a new proxy websites which you can use to surf the internet or You should use proxy softwares which will help you to bypass websense web filter. There are many softwares. I will list some of the popular ones here:
- Puff the magic dragon
- Hotspot shield
- Packetix VPN CLient
Use these proxy softwares to bypass any kind of web filter. For finding new proxy websites you can join many groups on yahoo and google which will deliver the name of proxy websites inside you inmail and i find this option personally the best as you will get more than 5 websites each day. Those websites will always be new. If one gets blocked use another one. Best of luck.