This is one of those services that makes me sit down and think: "what can I build on top of this?", kind of like how patio11 said he wrote down everything he could think of to build on top of Twilio when he first heard of it. [1]

I'll have to brainstorm with my notebook tonight.

[1] not the exact quote, but close https://news.ycombinator.com/item?id=1112615