I think as the iPhone toting, nude picture taking, over-sharing generation grows up, there will be some issues with nude pictures or scandalous twitter posts but not any more or any less than we see now. Keep in mind the 30 and 40 year old politicians managed to partake in the same exact thing. Cock shots. Affairs. Articles they wrote for their college paper that goes against what they preach now.
For the more intelligent, tech savvy kids, there were really only a few years where people were sharing everything without knowing the consequences. Today's high schoolers have grown up hearing about nude pictures being passed around the entire school, ex-boyfriends and revenge sites, parents finding out / cops arresting dumbasses who brag about their location during a crime, etc. They know what to post, when to post it, where to post it: Semi-anonymous things like Snapchat, more anonymous and differentiated usernames online, completely anonymous like Tor. Facebook is hardly being used by today's teenagers and there is a reason Snapchat is so damn popular.
I'm 23 and even I knew the dangers of posting things online. We didn't have cell phones with cameras and internet until high school, but we had digital cameras. When I was 14, my mother found out I ditched the Friday night football game to set off fireworks on the beach with some boys because a friend of mine posted photos on MySpace. I didn't even have a MySpace. At 15, two girls in my class were arrested for death threats that they had posted to MySpace.
My younger cousin (currently 16) is forced to be friends with his mother on Facebook. But he has his settings all crazy so he can choose to post to all his friends, or all his friends with the exception of his mom, family, and not-so-close acquaintances. His mom sees all the harmless things like surfing and random teenage musings, doesn't get suspicious that he's hiding anything because of the lack of wall posts or whatever, while never seeing the pictures from last weekend's party.
I also think we are going to see things that aren't acceptable now become a bit more acceptable. At some point, we can't spend weeks vilifying each individual person with a cock pic out there because every one will have a cock pic out there. My grandmother has a set of topics that she finds completely socially unacceptable to talk about. My generation talks about them all the time and doesn't even think about it, let alone judge each other because of it. I'm not saying that we'll all be posting our nudie-bits on the next Facebook or sharing our darkest secrets with the world, but we won't be spending 3-4 weeks of front page articles coving the latest dirt on a politician.
Now we know all that information has been stored and is ripe for being used against politicians to control them.
I don't know how prevalent this actually is. I think if one person finds a dark secret you posted online, others can find it too. Blackmail only works if you can get the single video tape back, not if it can be accessed via google or a light doxxing. Front page news stories and broken careers are what happen to politicians when they get caught. I would be very surprised if there was that level of corruption happening due to oversharing, although nothing would surprise me these days.
Also, you might like this post: http://hubski.com/pub?id=105950