If all you are wanting to do is set up a pre-made social networking site, even simple forum boards need at least something like Wordpress, which still requires a bit of knowledge of all the other stuff.
It would be a pretty boring website though. After the page has loaded it would be completely static until you loaded it again (or another page). You can forget new feeds or instant status updates, though perhaps that's a good thing.
To be honest though, there's such a glut of social networks that I don't think another one will add much to the mix. Helping improve an existing one is a better option. I'm sure that Diaspora* could use a few more hands on deck, but you'd want to gain some skill before pitching in to help.
Rusting In Peace :
Yeah mikedp because we'd trust that to build webpages when it's own website looks like total ass.