If he was stalking her, with premeditation, via the net, and or physical surveillance will certainly be important to this case. However if it can be proven that he had contact with her via SM, anonymously as he believed he was, and if the content of the convo was of a certain nature, considering her age, it will be very important to this case, IMHO.
If he had the resources to look at the SM info AFTER (simply to dispose of her car), it is impossible for me to believe he would not have been looking BEFORE.
Absolutely agree.
If he looked at her internet activity after the fact, he looked at it before to get a story rolling. Trust me, if he used the internet, he found her photos and videos easily. Could have even originally been linked some of her photos via one of his friends, or his teenager. The photos would get a lot of linking and a lot of looking.
Yep, it would all be premeditation. He knows it.
He also included in his story that she did not smoke or drink at his camper. He included that so a lesser charge will not be added. (Assuming she will not be found.) That lesser charge would be contributing to the delinquency, and he knew that in advance of his story.