Ha, just this morning, via the HN discussion on "Putting the Chat into Snapchat", I learned of jwz's axiom, which was modified for the sake of discussion: "Every program attempts to expand until it implements user-to-user messaging. Those programs which cannot so expand are replaced by ones that can." (https://news.ycombinator.com/item?id=7679031)
Looks like Foursquare was thinking along the same lines:
> We built Swarm because you’ve told us how often you still have to text your friends: “where are you?” and “what you up to later?” We wanted to build a quick way for you to know these two things for all of your friends.
Looks like Foursquare was thinking along the same lines:
> We built Swarm because you’ve told us how often you still have to text your friends: “where are you?” and “what you up to later?” We wanted to build a quick way for you to know these two things for all of your friends.