Does "the reverse" mean Sony? Yes, that has happened, without going in to specifics.
If people are wondering if we catch all the marketers, the answer is unfortunately no, and probably not by a longshot. I'm confident there are at least some amongst us right now. The biggest problem is that it is often difficult to tell who is literally a paid, viral marketer and who is simply profoundly captured by a particular company's branding/marketing, or who may have always owned Nintendo products and now feels heavily invested in seeing them continue to succeed.
There are, as a non-MS example, definitely people who refer to Sony as SONY and speak almost reverently of their products and games, but who aren't actually paid to operate like that. Apple fans are the most notorious for this -- they become so enraptured with the brand, so fully captured by the marketing, that they operate as viral marketers without actually being paid like one.
This makes our job of rooting at the legitimately paid viral marketers much harder.
This post was pretty fascinating to read.