Dear Ms. Rosenbloom,
You raised plenty of relevant, yet somewhat obvious points. Social media gathers more and more momentum everyday. It's gone from being a form of entertainment to a business tool. The story of Jessica Lawrence is evidence of this, as she was able to build a new life using Twitter.
Instead it's reached the point where we need to link all of our social media outlets together like Josh Kaufman explains in the article, or we have to rely on programs like Freedom to save us from our digital selves. Anyway you choose to look at it, it is clear that social media networks are not a phase and, although they are constantly reinventing themselves, they are not going away anytime soon.
P.S. Follow me on Twitter...See it's contagious.