A video purportedly made by supporters of the Islamic State makes direct threats against Facebook CEO Mark Zuckerberg and Twitter CEO Jack Dorsey for combating terrorism on their Internet platforms.<br />Internet companies are under growing pressure to more effectively police the presence of the extremist group in the wake of the terrorist attacks in Paris and in San Bernardino County.<br />The Islamic State - also known as ISIL or ISIS - use popular Internet services such as Twitter and Facebook to spread propaganda, to attract and train new recruits and celebrate attacks.<br />"If we have opportunities to basically work with governments and folks to make sure that there aren't terrorist attacks then we're going to take those opportunities and we feel a pretty strong responsibility to help make sure that society is safe," Zuckerberg said.
