Thread: "know" and "know of"

What's difference between "know" and "know of". There is a phrase: "Does anyone know of a good site?". As I know, I can say simply "Does anyone know a good site?". But are there any differences between these two variants?

Not much difference, if any.

I will take a wild attempt:

If you know a good site, that means you personally know it.
If you know of a good site, that means you may not personally know it, but you have heard it is good.

This works for some other verbs:
I've heard Beatles' music (I actually heard it)
I've heard of Beatles' music (I haven't heard it myself, but have heard people talk about it)

Thanks, I caught it!

Kalinka is right.

But in the example "Do you know of a good site" / "Do you know a good site", there isn't really much difference.