tommy mcfly from fresh fm is here with more on his "today" show appearance and, boy, the folks really up to see him, didn't they? >> it was for days and days people were in the rain and in the snow and in the dead of new york night to see justin bieber. this crowd -- >> look at that crowd. >> this crowd is unbelievable. >> what makes him so popular do you think? >> girls love him. young girls, old girls, but mainly younger girls love him. and he's safe. he's that cute looking every boy next door kind of thing and parents are okay with their daughters liking him. >> lyrics are nice and clean. matt lauer. >> narrator: viinterviewed him asked him to help him out with his twitter. >> i want to find out the power of bieber. there it is, you are faster at typing than i am. what should be my first tweet ever? >> your first tweet ever -- >> do i get a say in this? >> i'm going to speak very proper because i know that's how you talk. hello, period. next capital, hello. >> first tweet ever. >> everyone, go buy -- >> no, no, no. no, no, no. no, no -- >> justin bieber's -- >> how about -- >> well