With this you can send message in your profile feed like it was possible a few years ago.
Valve removed UI to send messages in your profile Social Feed but GameCoordinator Proto messages are still there and still functioning.
To use it change MSG to what you want to post
and create config.py with your credentials like i.e.
# STEAM
STEAM_LGN = 'lgn'
STEAM_PSW = 'psw'
# TEST STEAM
STEAM_TEST_LGN = 'lgn'
STEAM_TEST_PSW = 'psw'
# MY STEAM
STEAM_MY_LGN = 'lgn'
STEAM_MY_PSW = 'psw'