How many characters can a comment to a post have on Facebook? Note that I'm not referring to a status update or a root post in a group but to the comments.
Facebook – Maximum Size of a Comment on a Post
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Best Answer
Great question, though there doesn't appear to be any definitive answer. I think @1kenthomas 's answer is better than the accepted one, as there was (presumably) an attempt to obtain empirical evidence.
So, I've done a series of manual tests as of a few minutes ago, and the result was exactly 7,897 characters was the limit. Even one character more causes Facebook to reject it.