Hi, can you please tell me what is the worth of both these social communities and which one of them is superior with what reasons?

Squidoo is good. Lots of benefits to the user, opportunities to make some money (the more 'lenses you have the better'), good quality backlinks to your own sites and more besides. The key is to create quality pages, or as they call them - lenses.

I've never heard of Fanbox.

Thanks for your generous opinion. Fanbox is also a community like Squidoo. Can you please explain me the ways of earning on Squidoo? I never know about it.