I've had several.
Simultaneously, I've had several thoughts on which way this post was going to go. Originally I was going to go along the vein of a blog post from Zauber Paracelsus (which outlines the "nymwars" debacle to the date of that post, people embarking on "Project DeGooglefy" and alternatives to Google services).
Then I was going to do something or other about G+ and Facebook and problems with centralised social networks.
Somewhere in there I wanted to write about the DiSo project (which appears to have died), and projects such as Diaspora and Friendika, and how I'm wanting to attempt to help with everything, and where I'm going to expend most of my efforts.
Then I started wondering what all those people that aren't me want. Build it and they will come maybe, but "they" still need to have a use for it and be able to use it.