According to Facebook's terms of service, the individual who wrote the comment would be the rightsholder of it. This is consistent with copyright law, in which the creator of a work is the rightsholder unless other arrangements have been made.
If you are not the creator of the work, you cannot claim copyright on it.
Unless other agreements have been made, the creator is considered the copyright holder.
Contact Facebook with your claim to close the account.
Gloomy Sunday will be protected through 2038; it is controlled by Warner-Chappell and Carlin America.
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"Copyright registration may be obtained from the U.S. Copyright Office by formal claim which currently costs 760 dollars per claim, when selected, the registration can be received in as early as five days if there is proof of legitimate need for expedited service shown."
No you cannot "claim" copyright unless you are the original artist/author. Just because you "found" a copy of something does not mean you own the copyright for it. The only way to obtain copyright is to create it yourself, hire someone to create it for you, inherit it, or purchase the rights from the legal owner.
The only way for someone to claim copyright in a family crest is if that person created the crest, or substantially modified it, or is the heir of someone who did that and who died less than 75 years ago. Crests and other symbols may be protected in some countries by their laws protecting Heraldic symbols, but that is not copyright.
Depends upon what you mean by "claim". A minor can certainly OWN a copyright, like any other property, but in many jurisdictions the property of the minor is held in trust by the parents or guardians until the age of adulthood.
Copyright information on fabric usually appears in the selvage. You can only claim copyright on your own original work.
A standard brick, no. A remarkably creative brick, possibly.
Copyright exists in an item as soon as it is rendered into "permanent" form. The copyright symbol (©) is not needed, although placing it does give the copyright owner an easier time when trying to legally enforce a copyright infringement claim in the US. Before 1978, the symbol was needed to establish copyright under US law. Before about 1960, if you neglected to include the copyright symbol in a published work, it went immediately to the Public Domain. After about 1960, there was a way to remedy that defect, but anything published without the copyright symbol in the US before then was and is free to anyone to use as they see fit.