Hi, phish~ can give you the technical details but the concept is that if you host your own content on another site that you control, you can use the logs of that site to see who connects?

Now, if you can put a link on the orkut site that gets the surfer to load the content of your personally controlled site............... their details will appear in that (your) site's logs.

The fact that this information might be totally spurious has already been discussed.

1. A public proxy.
2. An "owned" machine
3. An "unwitting" proxy
4. Tor, or similar
5. A free wireless hotspot
6. An unsecured wireless connection
7. A public connection (library etc.)
8. Somebody else's machine (school, university, work)