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However, none of this applies to material from the modern era, such as net postings.
It is true that a notice strengthens the protection, by warning people, and by allowing one to get more and different damages, but it is not necessary. The correct form for a notice is: You can use C in a circle © instead of "Copyright" but "(C)" has never been given legal force.
Note that most inclusion of text in followups and replies is for commentary, and it doesn't damage the commercial value of the original posting (if it has any) and as such it is almost surely fair use. The court decides if the right to comment overrides the copyright on an individual basis in each case.