From the article:
A doctor’s appointment at 10 a.m. The places you’ll be, and when you’ll be there. The email addresses and telephone numbers of dozens, maybe hundreds, of your friends and family members.
The calendar and contacts list on your phone are comprised of highly personal, sometimes dangerously sensitive, information. That’s why we like the sound of a new Android app, called Flock, that adds an extra layer of encryption to your synced data.
Flock, made by San Francisco-based Open Whisper Systems, meshes with Android’s already-existing calendar and contacts apps.