If a there's a new user with less than 50 reputation Stack Overflow must hide the "add comment" option instead of displaying a popup saying: "You need 50 reputation to comment". And then if the user reaches 50 reputation it must show a notification saying something like: "You have been enabled to comment".

So the "add comment" option will only show if the user has 50 reputation.


New users will still see comments on other posts and wonder why they can't post them if you simply hide the comment link. It's better to leave the user interface element there and let them click it, showing them a clear message of why they can't use it yet, rather than hiding it altogether and confusing the heck out of them.

See also: Don't hide or disable menu items

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