never underestimate the community of crypto, bounties are great way to gain interest and promote a coin. twitter, facebook and youtube are preferable.
make sure you reward those who help you though especially if they believe in the project
Yes bounties can be a good instrument to promote... however many scammers around these days... just signing up for bounties make fake slack or telegram accounts, have worthless twitter and Facebook accounts and so on... just try to suck the bounties out of a project...
You need to be selective and careful as well!