Trending posts is not a recommendation algorithm, in my opinion. I think the slope stops at curation (interests-based algorithms targeted at specific users).
I.e. reddit homepage is now curated, Lemmy sorting methods are not.
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Estrogen therapy for transfems takes a while to have noticeable effects.
Two of the earliest effects for people are softer skin and growing areolas. I read a blog yesterday where the author said one of the first effects she noticed was her nipples growing to look like cis women's.