I liked Circa, especially its "breaking news" feature. The only reason I didn't use it that much was that it was very US-centric (I live in Europe). In particul

I liked Circa, especially its "breaking news" feature. The only reason I didn't use it that much was that it was very US-centric (I live in Europe). In particular, it would give me "breaking news" about some US sports celebrities I'd never heard of. Other that that, I really liked the way it structured stories that unfolded over time.