Ask HN: Cool startup related things to do with 24hrs in SF?

Hi, I'm a USC student coming up to SF for a night to attend a FBstart event at Facebook.

What are some other cool or informative startup related things to do or see while I'm in the city? Obviously company tours would be awesome but I know thats tough.

I've done the touristy tech stuff before (Apple Company Store, etc) but looking for other cool things.