When you add a Lightning Address to your profile -- whether Twitter, Youtube, Github, etc, you can receive tips from anyone who has a bitcoin wallet that supports sending to a Lighting Address (about 20 exist so-far):

https://github.com/andrerfneves/lightning-address/blob/master/README.md#wallets-supported

Alby makes it even easier though for sending a tip, as shown in the video in Bumi's Tweet.