In addition to these, compared to other SNS,
- Managed by a domestic company and with domestic standards
- Emoji reactions are fun
- Emoteki are fun
- Fun community
- Timeline is chronological and not pushy
etc.
If the number of subscribers increases, it may become even more attractive.
Some people may think that the 149.3 character limit is strict, but I think it makes it more relaxed, like a chat.
I think it's a good choice to start by invitation and automatically follow, and to start the initial timeline with posts from the invitee.