I've noticed that sometimes I'll post an opinion and when I check back on the question later, someone else has copied my opinion or at least made a variation of my comment. I'll check the timestamp to make sure I didn't accidentaly copy them but no, it'll be about an hour or something after my opinion was posted. I mean, if you like the opinion so much then just upvote it, you don't need to copy it, geez. I doubt they would've accidentaly copied mine because it'll be so similar.
It happened to me the other day. It wasn't like the guy had just made something similar - he'd actually copied and pasted what I'd written. I called him out on it and he was like 'I copied it because it was true and honest' or something like that, I don't really understand why he felt the need to copy and paste my opinion but whatever :P
I've noticed that too, normally on mytake comments. Someone will write a take, everyone will agree with it, then I will make a comment disagreeing with it and notice someone else make a comment right after mine, disagreeing as well.
I don't think they're copying, I just think some people are afraid to go against what they think is the majority but once they see someone else do it, they decide it's ok then. It could be something like that or maybe your opinion just influenced them so much that they just had to say something lol.
I honestly don't read comments normally before I post, unless it's just some dumb "how do I look" question.
You have to take into account that your opinion is not all that unique and many will share your sentiment.
"I think stealing is bad."
So does the majority of decent people. Doesn't mean anyone else who said it has copied you.
Unless you said "I rode a Hitler pony to work and made out with Captain America" and another user said the same thing, you're being paranoid.
That being said, there were instances where majority of users were agreeing on a subject, then my rude ass turns up and challenges OP's bull only to have other users follow suit. Then yes, this happens quite often.
I don't go back to see what others said.. and I don't open the whole question with opinions.. but there are sometimes when someone else notices and comments that we both gave a same opinion and it we laugh about it.. it is just a coincidence..