I have been watching the Bree and Cassie videos since the beginning, and yes I am new to this board, but I am a real person. My Youtube account is the same as here, so you can see how long I've been a member. To be honest I am just a busy working mom and do not have as much time as I would like to research this stuff. My lack of time is why my next observations are nothing but pure speculation, but alas, I toss my primitive speculations out in the hopes that someone else will be able to answer these questions.
I watched the Crawley vid Dan did again and thought more about the missing girl. Could her name be Cassie? Could Cassie be trying to help Bree by warning her? That's a rather obvious one, someone else may have brought that up.
Now, my next point goes out on a limb a bit and may be nothing. On the PostSecret.com site last week a post card appeared with "39 08.060 N, 77 19.270 W" on it. According to the author of the site it has something to do with this picture that was sent in later...

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All of the secrets are removed from the site each Sunday and replaced with new ones, but the author found it interesting enough to leave this info up until he can confirm something about the message. With Cassie leaving clues all over the place I thought this may mean something relevant.
I am very sorry if this info turns out to be nothing but wild geese honking about. I just had to say something.