What is a wall?

Question

It has been a while since I have gotten on the site and on my account page I saw something called Wall.What is it?Details please.

Answer 1

Man-made partician made of bricks
Imean
You can leave messages for other people on it so they can see it later.

Comments

Not just bricks. Stones as well.

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Wood, too.

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#KillingSomethingThatNeverLived

Evil people...

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okay...still confused??    ?__?