Do you see anything in the Second Amendment about semiautomatic weapons? Of course not, because technology has advanced since the time of the Founders. The First Amendment guarantees the right to speak by whatever media is available to the speaker, so long as it doesn't result in the proverbial fist hitting a person's nose.
Surely you realize that the Constitution isn't a laundry list of rights, and that anything that doesn't appear is prohibited? Under your theory the internet is not protected by the Constitution.