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Sounds interesting. I want to know this too! If anyone/the OP figures this out, post what you know, for sure.
There's a recent series of viral videos called Inside - The Social Film where a girl is locked up. I never watched it, but there was an ad on here that was similar to your description.
I remember that too! Not the title, but I remember the ending, and I knew it the second you described it. Man if only I could remember the title...
A very long time ago, I remember seeing a series of online videos that were creepy. The basic premise was that a bunch of teenagers or college age kids (I couldn't figure out if it was Dawson casting or not) were buried alive and had limited communication with each other.
the only thing I can think of that may help narrow the search (if it isn't narrow enough already) was that there was a red herring somewhere where the kids thought they knew who did it, but were wrong...not that not helped them escaping anyway.
Any idea to what this might be?