I always share on X, but then mainly use the GOSH part - in the POSH community, you can put snaps with the gosh hashtag. I read through how it works a few times, but haven't completely understood it - and I forget to do it, most of the time.
I share on reddit only for Splinterlands. The other posts, I haven't found communities yet. I'd have to dig deep into reddit and build a standing there, but I rather spend that time in the hive.