Voyager (formally Wefwef) is doing this. You can favorite communities and it will push them to the top. It's been useful for monitoring smaller communities.
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Oh cool. I noticed the stars in the community section. Didn't realize this is what it does.
Gonna start using it from now on.
Yeah. Algorithms!
But I agree, something tracks your interactions with different communities.
Or, manually 'voting' on a community, which is only for you, but does a multiplier on 'attractiveness' of the post.
You can iteratively make communities more or less prominent by slowly increasing/decreasing their multiplier.
As long as it's optional.
I am so sick of algorithmic crap it's not even funny. As long as I can turn it off, then by all means, develop away.