SAN FRANCISCO http://www.airmax97australia.com/cheap-air-max-97-white.html, June 26 (Xinhua) -- Facebook, Microsoft, Twitter and YouTube announced Monday the formation of a forum to help make their "consumer services hostile to terrorists and violent extremists."

The four technology giants said the Global Internet Forum to Counter Terrorism will formalize and structure existing and future areas of collaboration and foster cooperation with smaller tech companies, civil society groups and academics http://www.airmax97australia.com/, governments and supranational bodies such as the European Union and the United Nations.

Facebook and Twitter are social media networks headquartered in San Francisco Bay Area of Northern California on the U.S. West Coast, YouTube is a video-sharing website headquartered in the same area, and Microsoft is the world's largest personal computer (PC) software publisher headquartered in Redmond, Washington state.