Any Ideas?

Hey! My first post. Just a brief introduction on me: I've been doing PHP for about a year or so and in about 70% of the projects i've done i used PHP.

Anyway, here's my question:Any suggestions on how i can implement a "network" / "connections" algorithm using PHP/mySQL? something like Friendster?

"To steal ideas from one person is plagiarism, to steal ideas from many is research." - Anon.

EDIT: by "networking" or "connections", i mean something like a six-degrees-of-separation algo