KPCB launches $250m fund for social media applications and services, in collaboration with e-commerce giant Amazon, platform company Facebook and online games group Zynga.

US-based venture capital firm Kleiner Perkins Caufield & Byers has launched a $250m fund for social media applications and services, in collaboration with e-commerce giant Amazon, platform company Facebook, online games group Zynga, cable companies Comcast and Liberty Media and investment bank Allen & Co.

The firm would not specify how much its strategic partners were investing, but an investor told news provider Fortune that it was about $50m. 

In addition to capital, the participating companies will offer…