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During lockdown you might have been following classes on YouTube like Joe Wick's PE lessons or Maddie Moate and Greg Foot's science lessons, but what about the world's fastest growing social media platform?

TikTok now has over one billion users, with many people downloading the app during the lockdown period.

The app is normally used for doing dance challenges, lip syncing and pranks, but now lots of creators are using it to help teach you new things, and show off some good deeds.

Over the last few weeks, the hashtag #helpingpeople has increased in popularity, and has been used over 15 million times!

Let's take a look at some of the things people are up to...

Arben is a dancer and choreographer, who loves teaching dance classes in his studio.

With lockdown keeping him indoors, he has turned to live streaming on TikTok.

He wants to get everyone moving and learning new routines. Whether it's the latest dance challenge or just a new routine, Arben will be teaching it.

He says he loves the fact it brings together people from all around the world.

Have you had a go yet?

Could TikTok make maths lessons more fun? Well, meet Josh Martin, a student from the US, who is giving it a go.

From algebra to equations, Josh can be seen with his whiteboard trying to explain complex maths puzzles.

Meet Jack the service dog! This adorable dog helps his owner when she feels unwell.

Jack can detect when his owner is about to have a panic attack, he gives her cuddles when he can sense that she is feeling upset, and even grabs medicine for her.

What a doggo!

American sign language interpreter Dr Luanne Sailors has set up a TikTok in order to help people learn sign language.

She has deaf parents and learned to sign before she could talk.

Luanne teaches short phrases such as "Are you alright?", "Happy Birthday" and "See you later".

There are lots of users on TikTok who sign song lyrics in British Sign Language too, so get learning!

This Ramadan is very different to normal.

Usually, Muslims all over the world celebrate with friends and family, and break their fast together after the sun goes down.

But due to the coronavirus pandemic, joining together as a community isn't possible - not physically anyway.

But that isn't stopping some people using TikTok as a way of sharing food ideas and delicious recipes in order to celebrate the time from a distance.