I have just deployed a small bot @tagginator which will reply from mastodon to top posts in specific #lemmy communities in order to add #hashtags to them: https://github.com/db0/lemmy-tagginator
Take a look and tell me what you think or ideas for improvements.
@db0
Awesome!
I've similar-ish thoughts about using bots to help mastodon users follow lemmy communities (which I may ranted to you about before?)
One bot follows a community. A second bot boosts only top-level posts. Because the first bot has followed the community, all posts and comments get federated so that mastodon users can view them if/when they wish.
Mastodon users then follow the second bot and so avoid the firehose of seeing all comments.
There'd probably need to be a third admin bot which would work a little like aguppe ... you'd tag this bot with the community you want to follow and it would respond with the bot you need to follow (which would be the second bot described above). If necessary, this admin bot would create this second bot if necessary (when it's the first time the community has been requested).
This was the only way I personally could think of to solve the firehose problem on mastodon as there is, AFAIK, no back-filling functionality (though some masto forks have implemented it apparently).