This site will be used as my own personal social profile. All the other networks are meant to be aggregators or promotion channels, but they are not going to own my content and dictate rules of expression.
I strongly encourage everyone to do the same - reclaim your online persona - the identity that so many people see much more often than they see you in person. Use other social networks to share your original content if you want to reach out to your existing connections, but don't rely on a site that you don't own and don't control in any way.
I am using UNA Community Software to power this site, which MIT-licensed, open-source and free.
For now, it's just a personal site, but I also plan to launch a few small niche communities around my personal interests in the near future, all using UNA.
It's much better to be a builder than a tool.