Here's what I love about Google+ in general and the Google+ Diet in particular:I haven't personally ditched any of my other social media yet but I do find myself going to Google+ more and using Facebook and Twitter less frequently.
Instead of saying, "I'm going to write a blog post now," or "I'm going to send an e-mail" or "I think I'll tweet something" you simply say what you have to say, then decide who you're going to say it to.
If you address it to "Public," it's a blog post.
If you address it to "Your Circles" it's a tweet.
If you address it to your "My Customers" Circle it's a business newsletter.
If you address it to a single person, it can be a letter to your mother.
I'd say this is pretty revolutionary.
You can follow Mike's Google+ Diet experiment here. My Google+ public stream is linked here.