The trolls did send a postcard which was a printout of Chris during "For Julays eyes only". And in response, Bob took Chris' PSEye and that was it. Before that, there was the trolling event where Clyde sent those hookers to 14 BLC, causing Chris to cry for the first time (allegedly). With that said, It's hard for me to believe Bob knew how to find Chris on the net, yet is still apparently surprised with what his son gets away with, and still blames the trolls. Sure, trolls where half the problem, but the other half is on Chris and his insistence to engage with them. Again, why not cut the net? Chris wasn't ever going to listen to Bob. Bob and Barb never use it except to maybe pay bills. To be honest, the Chandlers would have been better off without the internet and live like any white trash family would.
Look at the house tour that Chris uploaded: Bob knew, and he knew he did not want that info out there lest the Chandlers get evicted. But what Bob didn't know is that no matter how much Chris deletes the info, it's already saved. And if Bob saw the CWCki and all of Chris' photos there, you'd best believe he'd want the CWCki shut down, which wasn't going to happen, and thus his only potion to save the privacy of his family was cutting down the internet. I would not be surprised in the arguments Bob had with Chris, that he blamed the internet for making his son cross dress.