There have been a couple of responses to this indicating that WebSleuths (WS) was the website where Chad (0r other criminals) could be using private message boards or other back channels to communicate with one another under the radar.
While that's a possibility, it's not what the original poster was talking about. The poster specifically referred to a comment on the Rexburg, ID police department's Facebook page that Chad recently has been active, since after he and Lori fled, in the private discussion forums or message boards of AVOW – the culty, dues-required website on which he and his entourage exchange end times theories and prepping information, set up seminars for the like-minded, and so forth.
Being on a "private" part of a website they've already used, and where they've made friends and gathered a following, seems far more plausible to me than the idea that they'd choose WS' private messaging feature as a platform for fine-tuning their plans. It could be a truly useful tip to the Rexburg PD, or to the FBI, so I do hope the person(s) responsible for the Rexburg PD social media presence takes note of the FB comment. It also would be helpful if someone familiar with AVOW, whether a LE person or simply a solid citizen, could do a little digging and see what they find, turning over any interesting information they uncover to the police. (Yet I suspect it also could be quite dangerous.
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MOO.