Prevent duplicate indexing of phpBB3 threads by Google

In a default phpBB3 installation(without an SEO mod), the same thread can be accessed through many URLs. For example, the thread Favourite Animorphs fanfiction can be accessed through these different URLs : http://animorphsfanforum.com/viewtopic.php?f=5&t=60 http://animorphsfanforum.com/viewtopic.php?f=5&p=659 http://animorphsfanforum.com/viewtopic.php?f=5&t=60&p=659 http://animorphsfanforum.com/viewtopic.php?f=5&t=60&p=659#p659 http://animorphsfanforum.com/viewtopic.php?t=60 http://animorphsfanforum.com/viewtopic.php?p=659 http://animorphsfanforum.com/viewtopic.php?f=5&t=60&st=0&sk=t&sd=a http://animorphsfanforum.com/viewtopic.php?f=5&t=60&st=0&sk=t&sd=a#p659 The agressive Googlebot might pick almost all of those links and it might lead to […]