I'm playing with Twisted (a P2P twitter clone). It's a very cool idea, but it's slow to download the initial block chain (tweets are text!)
miniblog.
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Neither Spotify nor Skype use peer to peer functionality any more.
Are there any consumer apps that still leverage P2P designs? Has bandwidth just become so cheap that it's unnecessary?
Hosting a Docker registry on IPFS! The global P2P content-addressable filesystem seems like a good fit for Docker images.
Scuttlebot is a P2P replicating datastore designed to facilitate decentralised applications: https://scuttlebot.io/
The list of available apps is impressive for a young project: https://github.com/ssbc/ssb-handbook/blob/master/applications.md
The apps remind me of IPFS' ambitions, although the protocol is different.