In regards to the first part of your post, VERY RARELY does a kid make a "fake" commitment. In these days, just as hoky alludes to below, even though coaches can't specifically talk about or to certain recruits, they can easily float information out there to quash rumors and circumvent the NCAA rules. One of the rare instances in which this happened, a kid from Canada (Devon MacAusland) had said something to the effect of "I'm committed to Boston College
I guess" in a random article and it was quickly noted throughout the hockey world including USHR that it was not true at all. We also saw a majorly embarrassing incident in which a football player did the "HAT GAME" commitment in front of his entire school and picked CAL, only to have CAL have to come out and state they never even recruited the kid and had no idea who he was (
http://sports.espn.go.com/espn/eticket/story?page=kevinhart)
Even though these kids have social media to fake a commitment, everyone else has social media to refute it.
In the case of these kids decommitting from Maine, I would imagine Maine had recruited them and offered them and a real verbal agreement had been reached for these commitments to have sat out there so long without refuting it, no?