Facebook, Amazon and Zynga will invest in a fund to help entrepreneurs develop applications and services for a new era of the social web.
The lion's share of the sFund's $250m (£160m) will come from venture capital firm Kleiner Perkins Caufield & Byers.
Details were announced at an event at Facebook's California headquarters.
http://www.bbc.co.uk/news/technology-11603380