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Do you want to see more posts about interesting topics in your Home timeline? And do you want your own posts to be noticed by others?
Here's how to do both these things:
1. Search for a hashtag you're interested in
2. On the results page, click the + or Follow button in the top right corner
3. Posts with that tag will start appearing in your Home timeline
4. Follow lots more tags
5. Include hashtags in your own posts, tag followers will then see your posts
More info at https://fedi.tips/how-do-i-follow-hashtags-on-mastodon-and-the-fediverse/
@feditips the mastodon app on Google play doesn't seem to have this feature. At least, I don't see a way to do this as you've described.
Yeah, the official Android Mastodon app doesn't have this.
I would strongly advise switching to Tusky or Fedilab instead, or alternatively you can do the tag following by logging onto your server's website.
@feditips thanks for the tip I've downloaded Tusky