Great post Ilias!

I can only add bitradio of which though I have no personal experience still..

I am also using Lit but managed to gather only 1 lit so far :P

Sola I have also not figured it out, but maybe after Easter I will find sometime to find out more.

There are some websites that use tokens, where you gather tokens when someone is looking at your post, but I am not sure if it is worth the time to mention them)