bitcoin but yes. Lightning is a payment layer for Bitcoin very fast and very cheap. Depends on your client e.g Damus or Primal etc. but you can connect a wallet e.g (Wallet of Satoshi, Primal has one integrated) to your client so ppl can send you small fractions of a bitcoin called Sats or Satoshi’s when you post content. It will appear as small amounts but could add up over time. It may take bit of time to get set up but worth it in the end.