Google+ branding guidelines
Twitter Brand Assets
Facebook Brand Assets
Find Facebook logos, images, product names and screenshots, and other assets and learn how to use them.
Logopedia
… a collaborative database for logos and corporate branding. It includes the history of successful company logos, popular branding, and more.
Logo, Bullshit & Co., Inc.
Everybody likes logos. Everybody wants their own logo. Everybody wants to make their own logo. Everybody has a computer and some fonts. Anybody can make a logo. What makes designers think they are so special?
Dated Social Branding
seeklogo.com
search 200,000+ logos — free vector downloads (brand logos) (AI, EPS, PDF)
all free logo
Vector Logo Database
Das virtuelle Markenmuseum
LOGO R.I.P.
a commemoration of dead logotypes
Corporate Identity Catalogue - A Website about Corporate Identity
the best brands of the world