Title, basically. Back on Reddit, there was a way to add a user as a friend. It made it easer to identify people (Apollo would highlight friends differently), as well as to see what they’re up to across all communities. There was even a feed for all posts by all friends, which was really useful.
I follow my favorite Lemmy users on Mastodon – since they’re both on activitypub, you can use the one from the other. I like it much better because that’s kinda Mastodon’s whole jam, following users. Here’s what it looks like from Mastodon looking at my account