As far as I understood some json_meta data is put into the account creation operation on the chain and frontends could send a small amount of posting rewards back to the referer.

This is an awesome feature if you ask me. Great idea.
We should discuss this with a greater audience first and reach consensus about the format of the json-meta data since we need some kind of standardization here.

I'll create a ticket for this great idea on the github repo. It's just a matter of time until it will be implemented I guess.