App.net

App.net is a for-pay social network, https://join.app.net/

Their core values are pretty great:

1. We are selling our product, NOT our users.

We will never sell your personal data, content, feed, interests, clicks, or anything else to advertisers. We promise.

2. You own your content.

App.net members always have full control of their data and the fundamental right to easily back-up, export, and delete ALL of their data, whenever they want.