There was this question asking why it is "generally accepted" to use "good to hear from you" while the OP thinks "good to read from you" is better.
"Hear" has the following meaning:
(hear from) Be contacted by (someone), especially by letter or telephone: ‘if you would like to join the committee, we would love to hear from you’
[Oxford Online Dictionary]
So you can't say it is wrong to use "hear from" in your example.
There was one comment:
The funny thing is, this does not answer the question one bit. Dictionaries follow usage. So basically you merely just repeated the question right back at the OP. They know that "hear" has that meaning. Their question is, why does it have it.– RegDwigнt
I commented back:
I don't think it is always true dictionaries follows usage. How long do you think our ancestors lived without proper dictionaries? How many words did you learn by looking up dictionaries especially those derived from Latin? Your logic doesn't work unless you learned to speak all those Latin words verbally from your parents or siblings. If he is asking for a word that is not listed in a dictionary, your logic might work, though.
Then, I thought it would be better to change my answer even though I felt a bit annoyed with the comment as my asnwer is not different from that of Centaurus.
Is my answer really funny? How should I take the comment?
Is it fair to comment only on my answer when the other poster's answer is almost same as mine?
I don't think it is fair to express your opinion in the comment without writing your own answer. This is a Q&A site, not a comment-only site. If I had been him and found any other anwer funny, I would have posted my own answer myself. Is there anyway to force such a comment-only-poster to post their own answers?