I worked on it for 3 days straights and got a working version.
I was very happy as I am not used to write UI nor build small web apps. I also used some new tech for me.
I shared it with few people but no one used it.
In the next few days, I polished it more, and made the announcement on Twitter.
I let ~10 people join and closed the registrations.
Not all of these people used the app, but I got a lot of feedback from those who did.
Also, surprisingly, publishing tweets and threads was working perfectly. The only bugs were UI bugs.