Factual error: At the end when you see Blaire's Facebook wall, you see a post under the newly uploaded Laura video that says "Sending love across the veil to a truly great friend, RIP Laura" this message was posted March 9 but the movie says her death date was April 12, 2013. (01:15:21 - 01:20:20)
Factual error: It's the one year anniversary of Laura's death, which, according to what is stated on the LiveLeak page and other parts of the movie, happened on April 12, 2013. The clock on the computer desktop says "Mon 8:57", but April 12, 2014 would be a Saturday. (00:00:40)
Answer: Blair's friends were responsible for some of the online bullying, but she said everyone is doing it, so they did. That's the only thing I can think of anyway.