For me it's the ones that read a manga that obviously has dark elements and complain about them as if they weren't meant to be there.
People who demands the main couple to break up for a simple fixable misunderstanding. They make it seem like the relationship is shallow that a simple problem is enough to throw it away. It's annoying to see they keep reading romance stories and then demand for a break up in every problem and overlook on the lessons that the story is trying to teach the readers. They would just delude themselves with "this is why I prefer being single" yeaaahh why not just admit they can't handle relationships.
How does one look up other accounts? I tried and the one I'm looking for didnt show up
It’s not really possible directly in the site but there is a way around it
You cant
If you're searching for a friend ask the friend to make a comment on a manga. Then you can click on your friends name and follow them