Saw this on r/futurology. From the comments:
How do you guys think this is going to play out? Will Facebook archives to the distant past be saved, will they be publicly accessible, etc. Every US President from the year 2030 onward has a Facebook right now, etc. No more guesswork for historians writing biographies. No more of historical sources being limited in scope to those with money or influence. No more -- I'm sure there are hundreds of things; I've only just started thinking about this. I could see this being a really interesting discussion.