Wikipedia:Articles for deletion/Justin Bieber on Twitter
pretty clearly a notable topic, as shown by the extensive analysis of the sources further up. Yes, 99% of Twitter accounts aren't notable, but this one is. Merging into Justin Bieber would seem a bad idea, as that article's pretty long already. I have to say I feel a lot of the 'delete' opinions in this AFD basically come down to 
— User:Robofish, 15:42, 5 July 2012 (UTC)
Stance: keep
Cited policy: WP:IDONTLIKEIT (Wikipedia:Arguments to avoid in deletion discussions)