i think you just told them what happened.
i think they brought up some internet posts b/c they thought you could've been chatting online about your activities and you barked like a dog...
not even at that point could they have pinned it on you b/c they need the MAC address of the machine you were using to definitively determine where the posts were sent from. you said they didn't even take your computer, which doesn't make sense at all. did a tech guy sit at the computer and sift through the hard drive?? if a tech guy didn't testify that there was no doubt those posts originated from the machine that was found at your house, then your talking shit about this site without knowing the legal grounds behind your incarceration, which makes you double-ignorant.
i don't buy for a single minute that the posts on this site were actually used as any sort of evidence. they put them on the table to get a plea out of you and that was that.....