In short, I have got 4 more invite codes for Keybase[https://keybase.io/], if you want to have a try, just send me an email at [email@example.com], I will send back the invite code asap.
If you are concerning about a safe, privacy message delivering method, or if you are searching for a modern PGP key server, I suggest you to cast a glance at Keybase[https://keybase.io/] - the brand new PGP toolkit for message crypto and delivery.
The Keybase service provides cross-platform software for message crypto. It also comes with a file sharing system called Keybase Filesystem(aka. KBFS) which offers public and private storage for each end users. With the help of the software, virtual storage mount at the real local filesystem , all files inside are encrypted, and you can edit or read it 'directly'. The greate idea is that using 'cross-named' space works just like file copying but the messages are signed and encrypted.
Here is a using example:
cd /keybase/private/<my id>,<your id> echo 'The brain...it moved again.' > diary.txt
That's all. And you can read this file directly in your keybase storage with the same filepath!
Keybase also have a web interface but with limited functions.
Also, if you care less about the message delivery, it also works like a traditional PGP key-server with public key-chain, a modern, beautliful web interface, and a easy-to-use software for encrypting or decrypting.
Now I have got 4 more invite codes, if you want to have a try, just send me an email at [firstname.lastname@example.org], I will send back the invite code asap.