There have been a lot of fresh faces here recently. If you're totally new to Mastodon or the Fediverse, welcome! 👋
It works a bit like email: you only need to sign up on one site, because you can follow people on other sites as the sites talk to each other. Telephones are similar, you can call people on other phone networks without having to buy a new phone, because phone networks are all connected together.
There are lots of good reasons why the Fediverse works like this, here's a thread explaining more about this: https://mstdn.social/@feditips/107083735491993183
If you're looking for people to follow, here are a couple of good places to try:
Trunk is a community-run opt-in directory of people looking for followers, you can browse it at https://communitywiki.org/trunk
FediFollows is a directory of accounts dedicated to specific topics, you can browse it at https://mastodon.online/@FediFollows/106855947486154929
If you have any questions about Mastodon or the Fediverse, @ me or DM me!