The latest Mastodon update lets you follow hashtags. When you follow, posts with a tag appear in your timeline automatically.

Try following #Gardening to make posts about gardening appear in your timeline.

This can be REALLY useful for discovering interesting accounts.

To follow a hashtag:
1. Log in through your server's website
2. Search for hashtag
3. Click it to see its results
4. Click on 👤+ icon in top right (click again to unfollow)

Posts from followed tags are visible in the apps too.

@feditips It's not on some instances yet, either.
@killyourfm @feditips it was added to @fosstodon and previously was not featured! nice!
@feditips how will be ready these upgrades to android #mastodon official app ?
GitHub - sk22/mastodos: Pink modification of the official Mastodon for Android app

Pink modification of the official Mastodon for Android app - GitHub - sk22/mastodos: Pink modification of the official Mastodon for Android app

GitHub
@feditips sadly, mobile apps seem to not support this feature yet. Posts from followed hashtags are shown, but there exists no button to follow/unfollow tags.
@feditips I love this, but I would like an indication in the timeline that reminds me that I follow a hashtag (and which one). Just a little icon would do.
@mattgriffin @feditips yes. A pop up list of followed-hashtags showing number of new posts next to each one, would be the logical next requirement to simulating a groups feature.

@feditips
Following hashtags is a really cool feature!

But where can you see, which hashtags you’re following? Only in the result panel? And is it possible to group followed hashtags in lists?

@feditips ah amazing! Looking forward to this coming to the apps.
@feditips How do you review and and remove hashtags you have subscribed to before?

@sonofjon I was just looking for that too. Also wondering how it highlights that it's a hashtag follow in my home timeline.

Maybe I just need to play with this a bit more to spot it.

@feditips

@mackaj @sonofjon @feditips You can see if it's a followed hashtag by searching for it again. The icon is different for followed/unfollowed. But I would love to know how to view all your followed hashtags. Haven't found that yet.
@sonofjon @feditips #metoo I would like the followed hashtags to appear in the "followed" list.
@feditips Long gone are the days on Social media using a computer; needs to be on the app.
@feditips Does it show all usages of the tag across the fediverse or just ones on the local instance?
@feditips does it follow federated servers and/or special relays?
@feditips : that's super cool but also slightly confusing because 9 times out of 10, I go "who's this person ?! why am I suddenly seeing this ?" and then I remember it's not the person, it's the hashtag :P I wish there was a color or icon or mention or something reminding me.
@feditips Is there an easy or convinient way to manage/remove Thema?
@feditips anyone know if mastodon is new?
@feditips I learn something new every time I sign in. Thanks 😊
@feditips it’s not clear to me how you manage hashtags you’re following. They’re not appearing in my list of follows and I’ve not found them by hunting through my preferences and settings. Only seems to be exposed on desktop. Perhaps my server hasn’t been updated yet? Not a clue.
@feditips would the followed hashtags appear on the home timeline? Or is there a specific place you can view all your followed hashtags?
@feditips nice! But you need a different icon ❤️
@feditips Great feature to be able to follow hashtags!
@feditips This is the COOLEST THING EVER!!!😃
@feditips is web first typically for updates? In the future will features be deployed on both at the same time?
@feditips what is the timeline for official app?
@feditips @SarahKimball here's a nice way to get started on Mastodon - to begin to see what is out there in terms of colleagues, potential allies, and resources. Suggested hashtags: #immigration, #ImmigrantJustice, #refugees, #healthjustice - let me know what you think!

@feditips
There is an app that supports it: #Fedilab on #android

@apps

@feditips freu mich auf das Feature in der App!

@feditips Is this for Federated Timelines or Locals only?

Also is there anyway to stop the auto-updates of Federated Timelines? It is impossible to read anything in that view.

@feditips Would be great in future to have more control over following hashtags; e.g., an option to follow hashtags in a list, instead of in the home timeline.

@stokes @feditips you can set up a separate timeline with hashtags only.

Go to preferecences; then appearance. Click ”advanced views. Now when you seach for a hashtag, click the settings icon and then pin. The timeline will appear.

To add more tags, click the settings icon of that newly created timeline and click ”add more hashtags”.

@FrankenGraphics @feditips Ah! Great tip, thanks. Will this not also put posts with that hashtag in my home timeline as well? If not, that's exactly what I was after! Thanks again.
@FrankenGraphics @feditips Oh! Pin the hashtag timeline but don't follow it. Just realised. Perfect, thank you!
@stokes @feditips yeah exactly! It’s a greatway to deal with tags you’re interested in, but are too popular/active to follow in your main timeline
@FrankenGraphics @feditips I guess now I'm using an app to interact with Mastodon much more than the web UI, my original point comes back into focus. If there was an option to follow a hashtag on its own timeline (like a list) instead of it being amalgamated into the main timeline, that would be perfect. Note – this is just wish list stuff!
@feditips I’ll wait. Not wasting my laptop time on this. This needs to come to the app
@feditips ooooohhhhh this is great

@feditips

Hashtag following is on the #fedilab app and you can see a list of hashtags you are following.

@feditips awesome new feature! But after unfollowing a hashtag the followed hashtags are still in my timeline. Any tips for that? Or is it a #bug?
@feditips Well let us know when it’s in the app, babe