Anonymous hackers altered Taner Akçam's Wikipedia entry and got him arrested by Canadian border police.
http://www.geekzone.co.nz/juha/2718
However, due to vandalising of Akçam's Wikipedia entry, which accused him of being a member of a terrorist group, he was detained by Canadian border police on February 17 this year. This is acknowledged in the Wikipedia entry, which can now only be edited by registered users.
Based on the detention and what US Homeland Security officials told him, Akçam now believes he can't travel overseas anymore because of the Internet hate campaign against him.
If you think about it, would you take your chances with border police after YouTube videos labelling you a "former terrorist"?
http://www.geekzone.co.nz/juha/2718