A person who uses youtube comments to push his/her own opinion. Generally, lots of caps and exclamations are used to conceal the fact that nobody gives a fuck what they are saying.
Youtube Activist: "The Soviet system was superior to THE West! It fought for freedom and dignity WHILE the corrupt Americans strove for LUXURY!!!"
Normal Person: "lol, this is funny."
YA: "How could YOU ever say THAT, The Soviets would HAVE defeated the AMERICANS no QUESTION!!!xD!!!!"
NP: "shut the fuck up cunty and watch the video."