To be a freethinker one has to be open to alternative viewpoints and give them serious consideration. As a blogger one tends to network with other like-minded individuals, which does not provoke as much introspection as might be necessary to hone a rigorous intellectual defence of one's position.
However, if one accepts the logical coherency of anarcho-capitalism, one must necessarily reject the coherency of alternative popular political stances, so where to turn for real thought provoking alternative views and criticism of one's position? I would be interesting to know if any ancaps or libertarians generally read particular blogs that come from a different philosophical or theoretical position. Certainly the blogroll of this blog is very ancap biased.