If your site becomes popular this could become a target for trolls. Eg. in some forums trolls will post a fake link to a logout page, this is why sites should u

If your site becomes popular this could become a target for trolls. Eg. in some forums trolls will post a fake link to a logout page, this is why sites should use POST or private keys for logging out. If you implement this blackhole it will become a much more serious target.