ReThink911 is a global ad campaign to raise public awareness of the freefall collapse of World Trade Center Building 7 at 5:20pm on September 11, 2001.
http://www.rethink911.org

51% of respondents are sure or suspect that Building 7’s collapse was caused by a controlled demolition, compared to just 18% who are sure or suspect fires caused it, and 31% who don’t know” — ReThink911’s Canadian YouGov Poll