[WaltPurvis]

Examples of this actually happening? Genuinely curious, as I've never heard of this phenomenon.

[sirbetsalot]

I think you can simply google Dick Costolo and hear him say it directly about 100 times.

[WaltPurvis]

That search actually turns up nothing of the kind, but googling for Twitter impostors and Twitter impersonation resulted in scads of relevant stories. I was totally unaware of this behavior. It's kind of fascinating, and sad, and infuriating.