? about commenting on posts on facebook

I cannot comment on anybodies post on facebook or send messages. I can post but cant reply to comments on my posts?? I think it is something i did to my computer but do not know what does anybody have any suggestions

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Clarification Request
more info

What exactly does it do when you try and comment? Or can you not see the comment box at all?

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Have you tried to check in your facebook settings? Maybe you've changed something... I'm sure it has to do with your facebook account and not your PC...

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