I have written a general ratings package and will probably
do member value as well but am probably not
going to do explicit social networking things (at least not
in this round of the community of practice work I am doing).
The code is in cvs in contrib as cop-base and cop-ui.
One word of warning, it is likely that I will refactor the
ratings, visits, related items, and clipboarding functionality of cop-base into seperate packages so
if you want to use it be aware that the namespaces may change
drastically (although I don't think the datamodel or code
itself should change much).