Every network is unique, I don't think you could ever replace Twitter. Anything not Twitter is going to be different. Twitter itself is constantly changing.
A better question might be, what are you CURRENTLY using as a place to find communities (if this is what you're looking for) outside of Twitter? Answers to this question are going to be the most useful.
Every community is unique. FB is useless to me for most things, but there are some communities which thrive in FB groups. Some communities have a thriving Discord, other communities in adjacent domains might be more into Slack. Finding the right spots requires a bit of hunting. Reddit is great for some communities, dead to others.
What I like about Twitter vs any other network tool, is the random interesting stuff I can come across which is still somewhat related to people I follow. I don't see that replaced by any other platform. Niche places have more utility in some ways, but less randomness.
A better question might be, what are you CURRENTLY using as a place to find communities (if this is what you're looking for) outside of Twitter? Answers to this question are going to be the most useful.
Every community is unique. FB is useless to me for most things, but there are some communities which thrive in FB groups. Some communities have a thriving Discord, other communities in adjacent domains might be more into Slack. Finding the right spots requires a bit of hunting. Reddit is great for some communities, dead to others.
What I like about Twitter vs any other network tool, is the random interesting stuff I can come across which is still somewhat related to people I follow. I don't see that replaced by any other platform. Niche places have more utility in some ways, but less randomness.