It's basically Twitter with nicer people. For the most part, people follow back. There are a lot of follow-and-follow-back trains - mainly people helping newbies get connected. I think I'm seeing less of those over the past week though.
I haven't put a lot of effort into the app, and I am approaching 2000 followers - I've followed back everyone. Trump has 847K followers, and that's probably a good guess at the number of active users who have made it in. Someone on there was tracking Trump followers as a gauge of how quickly new people were being let in - his follower number was increasing by about 20K a day.
There are a few trolls, but people tend to ignore them. There have been some bugs, but they are resolved quickly. Still, I can see why they chose to slowly increase the users, rather than throw open the floodgates.
There are some National/News type of accounts, some politicians, some organizations. I think that number will grow eventually.
Waiting to be let into a social media app was annoying, but it's fun once you get in.
The thing is that I have seen very few copies of things ever posted from Truth Social out there in the real world. And it is not accessible even in a read only mode for those who are not members. Therefore Truth Social has no effect on the world.