Thanks everyone for the posts. I am going to check out that book.
From a legal perspective, I want to point something out. The law in every jurisdiction on admissibility of online evidence varies. Some jurisdictions don't have any case law (like mine, in Arizona).
A common viewpoint right now is that a post/email from a specific user PLUS something else (IP address traced to users home, information specific to only that user, etc) is going to be enough to survive the initial authentication burden for the offering party.
Once the offering party has met the authentication threshold, the burden shifts to the opposing part to present evidence on why the other side's information is not sufficient to authenticate the evidence as being from the given individual.
For anyone who wants more information on the actual legal basis for entering evidence, I highly recommend the article "Authentication of Social Media Evidence" by Judge Paul Grimm.
As I am both an examiner and a lawyer, I tend to work with the people who hire me in drafting motions and arguments for courts. I always given them a copy of Judge Grimm's article, because he is considered one of the leading legal scholars in this area.
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