Well, back in the 19th century people were with other people a lot. Families lived closer, people had more siblings, hobbies were usually outdoors. Technology and modern living served to physically isolate people, but the emotional desire to communicate (when the need strikes) remains. The internet allows a "have your cake and eat it too" mentality, because you can casually talk about things that might not rate a dedicated phone call, and it's more low key to send a 1 line email, an IM, or a text, and no ones expecting an instant reply in most cases. We're getting back what we lost.
The problem is, in the modern iteration, the murmurings don't go to your brother sitting next to you, they go to millions of viewers (in the case of the congressional 'tweets) and are there for later review.
People are just realizing the "mental diarrhea" that comes out of most people daily is really not that interesting or slick. It's not like a well-considered and thought out paper or work with a real point, it's just raw unfiltered and uninteresting humanity.
It's sad that politicians are lowering the public discourse because they are convinced they lost an election because they didn't use enough gimmicks. They lost because the playing the religion/abortion/homosexuality/Reagan fiscal policy cards won't work on the modern generation who either don't care about those issues or just took the time to observe the the conservative movement became a puppet for big industry and abandoned their central tenets. I want to see a Real Ron Paul Republican party rise from the ashes, but until then there is only one choice for most folks. By posting inane details of their day, during events they SHOULD be paying attention to, politicians remind us why we need to get these baby boomers out of office.
In the modern world, we can look up your voting record, we can pull up your campaign promises, we can fact check your claims. So now, maybe start representing us and providing real substance instead of playing games. Twitter is a tool with a specific use case, apply it when it's relevant, just like other tools of the modern age, and do your job.