The problem LensTag solves

The precise problem it caters to is the inability to do any kind of promotions distinguished through hashtags on Lens. And also, it is ideal to have a stream of tokens flowing to the account, instead of a one time payment when someone decides to use a hashtag for promotion. This is enabled by Superfluid.

Challenges I ran into

The docs for both the Lens protocol and Superfluid were very helpful. I did not run into major bugs, except for compatibility issues. I was trying to use Wagmi, however, getting the Signer object from it is a bit tricky. Similar things happened when I tried to use Viem instead of Ethers. However, shifting to mutually compatible versions cleared out most of the blockers.