I was looking through the explore section, and I found that a lot of the problems that Ankit Vijay made were pretty nice. Although the English is not impeccable, the problems still get the point across. His problems are more for the lower levels, as they are quite elementary, so if you are a lower level and you need to practice your hand on problem solving, I suggest following him. He posts problems every day, too.
If anyone has any other suggestions for people to follow, feel free to post it in the comments.
EDIT: to clarify, if you have seen other people who have nice problems but do not yet have that much publicity, I encourage you to share their profiles.