Tens of thousands of Isis videos, speeches and publications have been shared on an internet archive site despite repeated warnings that it is being exploited to spread terrorism. Isis content that remains accessible on archive.org includes a 124-page booklet on manufacturing explosives made by the “Islamic Media Center” and a video of the Paris attacker pledging his allegiance to the Isis leader Abu Bakr al-Baghdadi before his rampage. The Counter Extremism Project, a nonprofit group, contacted the archive in 2015 and again in February this year, drawing attention to specific posts.