I know before I ask that I am being unreasonable about what I am going to say.
I don’t know why, but it makes my blood boil when posters start their reply to a post with ‘this.’
Why on earth do you do it? We all have enough of a brain to know that your answer agrees and/or relates to the post it is answering. It just seems a stupid and pointless thing to do. Why not just say ‘I agree’ if you really think it’s necessary?
Another attempt by Trump to end the war with Iran
World Class Museums - why are they free to everyone?

It’s as valid a way as any to make it clear we agree with a post.