Kloak

Kloak allows a group of friends or colleagues to share status, photos and location, privately. The Kloak application and its online service is protected from the usual social networking data-mining via end-to-end encryption. Data shared with your group is never shared with anyone else. Kloak is brought you by SpiderOak, a privacy company known for SpiderOak One encrypted cloud backup.

Kloak is built with the Crypton framework: https://crypton.io