[TelmoMenezes]

Email.

It lets you have private and group chats, organize events, share photos and links, keep contact lists, etc. I know is hard to see, but email is quite sexy: it is decentralized and vastly adopted, more so than FB. It works on every platform and it's been around for a long time. And it's not going anywhere. It's the dream of all the anarco-crpyto-hackers and it already exists! Sometimes it's hard to see the obvious.

And I think email could still be vastly improved by better clients. It just so happens that there is currently no big economic incentive to create one.

I believe that we are still in the very early moments of the Internet, and we are collectively doing a lot of stupid shit. Like the first few decades of synthesizer music. We have to go through some silly stages before getting back to our senses and developing some taste.

Also RSS, newsgroups and other blasts from the past. Everything has been reinvented poorly and plastered with ads, but just wait a few years...