A simple message peer-to-peer

Hi @jesta
I have been searching for a way to send a message to a steemit member. Suggestions include using a small amount of money and then attach message in wallet, but I am just Dust with no real value....
Busy has a chat but it is public I think.
They say the blockchain has the capability but probably no need to send all kinds of junk .
What about an interface to WhatsApp or Telegram or other open source software.
If I send a hello message to greymass will it get to @jesta ? seems the other two are not active in months....
Maybe I can help (volunteer), I notice the main 49 tags on Steemit are not the same on Busy or chainBB

:-)