Them: Faving posts on Mastodon is useless, only the OP sees it.

Me, when a post gets faved: awwww, little internet hug ✨

@Lilliana_S
So no one can see what I like outside of op? Oh, I'm gonna love this.

I was always so anxious about liking things on Twitter because I used it mostly as a bookmark for threads I didn't want to read at that moment. Wait... Can I still see what I like? I need to better navigate this app.

@gwimo No, the opinion I quoted isn't even true XD
People can see who liked a toot when they go into the stats of said post.
And apparently if you like a toot you also add it to the federated timeline of your server.
However, only OP gets directly notified about your like which is what makes it feel more intimate.

@gwimo nah, honestly I think you're good. While this info is available, people need to actively check it to access it and I think most people don't 🤣

For Mastodon, if you want to have access to a post in the future, I recommend using the bookmark function though.