I could see if the poster had mistaken one person for another and included that in their post. But the remarks usually just come out of left field for no apparent reason. Also, quite often I've read that someone looks exactly like someone else and there seems to be little resemblance that I can see. I've heard of some sort of condition that some people have where they can't recognize faces. Maybe seeing resemblance where there is little or none is related to that condition?

If an actor isn't well known you have all the brainless LOOKS LIKE threads. It's a plague.

It is something that started becoming common as Amazon started referring people to the site, around 2005. Apparently, Gen-Xers and Millenials spend a lot of their time confusing celebrities for each other, or finding similarities between them. I think it's an outgrowth of them telling their friends, "You look like." It got annoying after a while, because it started taking over the Discussion Boards. It started turning them into juvenile gossip fests and popularity contests. In fact, it got so tiresome, I stopped frequenting the site and contributing. Any attempt at serious discussion of a film, or movie making in general, quickly degenerated into "looks like" fests, or if someone is gay.
"Oh Benson, dear Benson, you are so mercifully free of the ravages of intelligence."

No, age is usually confirmed, factual and not open to debate.
LOL!!! Riiiiiiiiiiight!

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Its something human I guess. Lookalikes and age are the two main questions on every IMDB board.

I don't understand the obsession with finding lookalikes either. It is amusing sometimes reading how odd some of the lookalike comparisons are though. By the way you write very well for somebody whose first language is not English.
Get on the scale! Get off the scale.

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I'm really happy for you. That is indeed useful.
Now if you come with me.. Yes come here Juuust a little bit further. Gooood boy! Now just lie down here and dream sweet dreams Yeees that's it. Close your eyes! Goooooood boy Sweet dreams
(unlocks a cage full of 200 starving, rabid rats)
SURPRISE!

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Ah, the grammar police are here. Good. I've corrected it now, ok?
I'm Norwegian so sometimes I write English incorrectly.
You knew what I meant anyway. You're just being difficult.
Anyway, now that I've corrected it, do you have any useful info?

Why did you write look's? Look is, look was, something belongs to the look? Then why didn't you also write post's?