Actually, I've found that they tend to be fairly accurate at reporting 'what' is happening - it's hard for several people at the same time to post unique, fake

Actually, I've found that they tend to be fairly accurate at reporting 'what' is happening - it's hard for several people at the same time to post unique, fake videos of people driving around with guns while others are posting corroborating textual accounts. The 'why' part is a completely different matter. If there's any interpretation or time difference between the event and the post, scepticism is absolutely warranted.