Joined: Oct. 2007
Just checked the Talk.origins Archive website. The Posts of the Month include a few examples of successful de-tarding, for which internet de-tard activity was a non-trivial contributor.
One in which losing the tard did not entail losing the religion:
One in which losing the tard was more-or-less accompanied by losing the religion:
A collection of links to de-tarding testimonies which, while prolly not involving internet de-tard activity in specific, appear to support the hypothesis that exposure to the truth is a significant contributing factor to successful de-tarding: