As far back as the days of Usenet internet libertarians swamped and dominated every internet forum they encountered, out of all proportion to their representation in the population. This was true, for instance, in the old thomhartmann.org forums, so much so that moderators and Thom himself had to point it out. The methodology hasn't changed since the 80s and 90s, arguably since the 70s. They post prolifically, almost daily. they post long tendentious arguments and get "bumped" when they collect replies. Purely on a reward/effort basis you won't get ANYTHING by replying to them. The 0.01% that are amenable to persuasion at all, even on a single point, won't make up for the free advertising - for something that, after all, has a good supply of funds we should help dry up by making them pay for it.
The "how" part is pretty simple. Instead of replying to a member blog or forum post, collect generic bad arguments, pick a couple, organize your take in an offline document, shorten your response to something readable, post it. You gain all the views and hits and you don't have to reference the bad claim-maker by nickname.
This is pragmatic advice, based on experience.