That's a good point, there is a small college, Vermont Technical College, in Randolph Center. They could have been trying to make it seem like a student from the college was involved, just to further complicate the issue. The planted semen may never have been intended to be traced to Juve2; merely to deflect suspicion from MJ, because what were they going to do, DNA test every male in the town? If Juve2 would not have had any other reason to come under suspicion...his DNA only serves to throw LE off the track from MJ.
But I think the ruses set up in the MySpace page were different from the ruses used on Brooke. The "skittlemeup" message was intended to be read by LE and others, not Brooke.
I think "Sam" refers to a local boy that Brooke may have liked, someone from school or a nearby school,... maybe a friend of Juve2. It sounded to me like they thought that the mention of "Sam" was really going to spark a response in Brooke.... that he was a known quantity. If so, he may have no idea they were using his name as a lure.