After a little FB sleuthing, I found a few interesting things to note that perhaps links the relationships between some of the names involved. Not sure if this has been mentioned before and may not hold a lot of weight but still interesting...
DR is not friends with JR, CR, or MB on FB (I actually was not able to find MB on the site). JR is however friends with LS's roommates at the time. Just makes me curious about the phone call to DR. While not being friends on FB doesn't necessarily mean JR wouldn't have DR's number, it is curious how the phone call was made. Perhaps LS did make the call and knew DR's number by heart? Or perhaps DR and JR strictly had a drug connection?
Another note about JR: he did "like" the Official Lauren Spierer page. To me, it seems if she did OD and they freaked out and hid the body, the last thing a guilty conscious like that would want to see are the updates on LS and the letters from her mom. Just interesting to note...
Also, ZO is not friends with JW on FB. To me, this rules out the confrontation at Smallwood as having anything to do with JW. If you are going to punch someone in the face because they are with your friend's girlfriend, I would assume you'd be close enough to be friends on FB. ZO is friends with HT, but his friend AB is not.
Also, from what it seems CR does not seem to have any linkage through FB to anyone. I cannot see who he is friends with or who JR's friend list is to confirm if they are.