Okay, it's time to tell new users a secret about Mastodon.
Mastodon is (whispers) part of a much bigger network 😮
Mastodon servers use an open standard called ActivityPub to talk to each other. That's how you interact with people on other Mastodon servers.
But, dozens of other federated networks also use ActivityPub, so (this is the good bit!) you can follow people on these other networks from your Mastodon account!
For example:
PixelFed (https://pixelfed.org) is a photo sharing network, here's a random example account @Iancylkowski
PeerTube (https://joinpeertube.org) is a video sharing network, with a p2p system that allows videos to go viral even on small servers, here's a random account @craftykat
BookWyrm (https://joinbookwyrm.com) is a social reading site, an open alternative to Amazon's Goodreads, here's a random account @mouse
Together, Mastodon and these other services form... The Fediverse 
(whispers) Click on the link...
https://framatube.org/w/4294a720-f263-4ea4-9392-cf9cea4d5277
@feditips @Iancylkowski @craftykat @mouse Wow, I was about to ask to Mastos if a "Insta like" was existing… it looks like… yes : Pixelfed does the job, right ?
@hackbyte @Iancylkowski @mouse @feditips @craftykat But… do I need to create a new account on it or… how can I do ?
@luce @hackbyte @Iancylkowski @mouse @craftykat
If you want to have a PixelFed account, you need to sign up on a PixelFed server.
There's a list of servers at https://fedidb.org/software/pixelfed
By the way, you can use Mastodon apps with PixelFed accounts, just sign in as normal.
@feditips @hackbyte @Iancylkowski @mouse @craftykat Akright, thanks ! But if I understand correctly, I can't use a PixelFed app (does it exist ?) with a Mastodon account ?
@luce @hackbyte @Iancylkowski @mouse @craftykat
Short answer is no.
But PixelFed only has one dedicated app at the moment anyway..