Google – Catull BQ


Twitter – Pico Alphabet (Modified) or Close Match (Modified)


Facebook – Klavika (Modified)


Grooveshark – FF Nuvo


Youtube – Alternate Gothic No. 2


Yahoo – Yahoo Font


Digg – FFF Forward (Modified)


Cork’d – Triplex


Vimeo – Black Rose or Bello


Envato – Agenda Italic


Tuts+ Network – Lubalin Graph or ROCKWELL


Last.fm – National (Modified)


Technorati – Neo Sans Medium


Flickr – Frutiger Black


Purevolume – Avenir Book


Basecamp – Whitney or Interstate Bold.


Engadget – Engadget Font (Close Match)


Hulu – Futura MDd BT (Modified)


Bebo – Neuropol (Modified)


TMZ – Amelia


The ONION – Eagle Bold


Mapquest – Cheap Motel


Linkedin – Myriad Pro Bold


Skype – Helvetica Rounded Bold


Revision 3 – VAG Rounded Black


Teclado de la MAC - VAG Rounded por Gerry Barney


Goplan - ITC Officina Sans


Para terminar esta pagina ofrece la posibilidad de detectar en base a la imagen de un logo que fuente es:
http://new.myfonts.com/WhatTheFont/