Twitter:

abstract fonts  ·  Free font updates.

acidfonts  ·  Free fonts for the font generation.

Chank  ·  Commercial and free font designs.

CBGB  ·  The '70s alternative music venue.

Font River  ·  Get regular tweets about the latest free fonts.

Fonts.com  ·  Commercial fonts.

fuggirls  ·  The girls from Go Fug Yourself.

Pee-wee Herman  ·  Friend of Dottie and Speck. Nemesis of Francis.

Reencoded  ·  A web design blog.

Robot Johnny  ·  Illustrator and font designer.

Santa Claus  ·  You know him....big guy....red suit....hangs around at
       Christmas....

Tack-O-Rama  ·  Hello world....

TheBlitzkrieg  ·  Marky Ramone.

The League of Moveable Type  ·  Great fonts - free and commercial.

TheWarholMuseum

Typodermic  ·  Font designer Ray Larabie. He often gives away fonts to the
       people following him.