Arik Hanson quotes a bunch of people, including me:
Imagine if someone created an application that aggregated your social networks such as Twitter, Facebook, Foursquare, Instagram, Last.fm, and maybe integrated with your FitBit or something. You could get all the music, wake-up, location, photo, and status-update stuff directly from your existing networks, then figure out a way to consolidate the duplicate content across networks (that’s the hard part), able to filter out stuff you should see towards the top – as well as view like a fire hose (something Facebook does well and Twitter does not), then throw an awesomely formatted timeline on that data. Think if Flipboard’s social feeds were in one string and read like a timeline? Why would anyone use Path? Wouldn’t that be awesome?