Yes, in a way. If you followed them on a different nostr client like Amethyst, their posts will also show up on Damus.

But also, people will share their npub in their Twitter bio, for example. Their tweets won’t show here (until Twitter builds a nostr client…..) but you can copy the npub from there and then find them more easily here.

It’s just a bit tricky to search by name, so it’s easier if you have their npub already, or if you follow your friends’ follows and build out a community web that way

Hope this helps!