In the future world depicted in Ghost in the Shell technology has advanced to the point where creating 'perfect' fake video footage has become trivial. As a result, anonymous videos of important incidents are mostly useless unless a trusted news organisation or government can back up the reports.
Indeed: Ahmadinejad's supporters have released photoshopped images showing that the rallies supporting the regime are bigger than they are in reality. Trick photography was used for a similar affect by the US in Baghdad.
However, it will remain difficult to have multiple corroborating photographs of the same event that all match up. Making the truth match up is easy, but making forged videos and photos consistent when lots of separate people are releasing them is hard because it's hard to keep lies of any kind consistent without the liars being in cahoots.
Which means that reports from random people are probably more reliable than journalists or governments. Governments and news organizations can collaborate on a lie better than mobs.
It doesn't even have to be 2029AD. Technology is getting really good at this even now. Think about all the believable special effects you see in movies; imagine what a competent and well-funded team in the service of some govt agency could come up with. It doesn't have to be realtime.
Even amateurs can create believable-enough photoshop images these days, video is surely not far off. I would surmise that certain people are well aware the tech is there, or almost there. We may just need a crisis before they're able to use it.
