Is it tacky to remind people that tipping is an option they can do? Sure, but who gaf. Be tacky!
If a street musician can have a sign up asking for tips, why can't people entertaining you on the subway of social media?
Kira Secura 🔱 Goddess of...?
Tipping is a way to say "Thanks! I want to see more of this in the world!" In a way that actually encourages people to do that (whatever it is, friendly service, art, education, posting random thoughts...) in a world where money is required to survive.