I don't write any of my material down. I like to improvise and be spontaneous.
I'm willing to write a check for $10,000 if someone can bring to me what I fell is ruining thousands of lives, destroying lives everyday. And I know that you know it's a little thing called Chupacabra.
My advice is: to try and stay really true to the things that make YOU laugh, as opposed to trying to create a character that you think is funny. Some comedians get into bad habits when they are trying to create something that is not them, and they are trying to write a voice that isn't their true voice.
I'm sure that people who have been tweeting funny things have ended up on writing staffs of a late night show.
If you think your demeanor is mellow or not particularly charismatic, the material can life you higher. So write everyday, and get onstage or in a coffee shop where they are doing open mice, anywhere you can perform even if that means starting your own open mic night - and be your own self.