Good Social Networks

Adoppt is a community of online friends, diaries and journals. You can start your online journal (aka blog or weblog) for free, share thoughts and favorite web sites with your friends and meet cool new friends.

"PathConnect links yu up with people who are into the same stuff you are!" Social network based on life goals.

"Multiply gives you an easy way to share all kinds of digital media, including photos, blogs, videos, music and more, all in one convenient place: your own personal web site. With Multiply, you can share and discuss your stuff with everyone in your "social network," and also be alerted whenever they have something new."

Flixya is nearing the release date of the latest version of their
social media network site, featuring a new platform built from the
ground up and 100% revenue sharing. Users can upload photos and
videos, write blogs, and even share embeddable flash videos from
Youtube, Metacafe, Livevideo, and more. They have taken monetizing
user generated media to the next level.

Connections based on personal contacts, colleagues and classmates.

OK maybe a bit more for the kids but they have schools / universities and things on there you can look up who you used to know

Local and interest based groups.