Kubuntu (Ubuntu but KDE), both great KDE UI and stable kernel. I use Kubuntu LTS.
Could be bc of how you set sorting comments in your account vs guest’s default.
Opposite to Instagram or Facebook, on Lemmy or Mastodon you can create an anonymous account. Yes it will be logged (normal public internet), but you won’t be treacable. The UI doesn’t have any tracking scripts, and many instances don’t require an email even to sign up. Use the Tor browser to spoof your IP.
I only browsed reddit through libreddit. I don’t use social media at all, but told myself of why not giving the fediverse a shot, it can be the healthy social media. Though I’m still trying to find a good microblogging instance (mastodon, pleroma, misskey, akkoma, soapbox etc…). It’s harder for me to get in microblogging unlike a forum website like lemmy.