Could someone explain why this is not a valid answer? If the OP felt this was the answer to his question, then it is. If there isn't any other solution, this is the answer he was looking for. I'm getting really, really sick of these audits.
While it's true that it's a self-answer by the OP, it's absolutely not an answer- it's clearly meant as additional information, the kind of information that would fit well in a comment or an edit to the original post.
Imagine that you Googled this issue, and came across this question, happy to see that it has answers. Would you be satisfied by the answer that it occurs only in certain operating systems?
It's not an answer because the OP isn't answering any question, just adding conflicting information from what was in the question. The question states:
"It happens in all browsers and operating systems"
Then the answer is:
"There is no problem when using Windows or OSX"
So is that an answer? No... that just means the information in the question was incorrect. The actual question from the post was:
"When I click like the site is liked but when I add a personalized message to the share nothing appears on my wall....Does anyone know why this is happening?"
"I have found out that the problem only occurs in Linux."
Does not even attempt to answer the question. That's why it's not a valid answer.
I have to disagree with your sentiment
If the OP felt this was the answer to his question, then it is.
If the OP is happy with the fact that his problem only happens in Linux, then he can remove his question, but that won't help anyone else who wants to understand why the problem is happening, or wants to fix it.