If you're looking for an alternative to the Netflix Friends (tm) feature, there is a site called SPOUT, which allows you to create a profile and share your movie-related thoughts with your people in the Spout community. It's also a shopping site, so each movie has a link to the Spout store.
You control who sees your stuff. You can create lists of movies, tag your movies, recommend them to others, and discuss them in the forums. It's still in beta, so it has bugs and shortcomings, like there's no way to rate or review movies, or browse tags.
I joined, but my only list is movies I'd like to see. Having rated over 2,000 films on Netflix, there's no way I'm going to take the time to rate those same movies on Spout, and they don't have a way to upload your data. I have my data in plain text on Listology, where it's easy to copy and paste a list. Spout doesn't have a recommendations engine, so there's no real incentive to take the time to rate movies.