This seems like a bad idea in that it allows the powerful to completely control the messages that are affiliated with them. Suppose celebrity x does wrong to a regular citizen, and they have Google posts at their disposal while Jane Smith does not.
On the other hand, this seems like something Rick Santorum might have been grateful for.
I can imagine the popular, rich and powerful to love it. Imagine avoiding all the abuse, threats, snide remarks, witty rebuttals, imaginative memes and uncomfortable truths that Twitter gives them as a platform. People want something more sanitized as a platform. It's quite an interesting development.
On the other hand, this seems like something Rick Santorum might have been grateful for.