It should be no surprise to anyone that many celebrities and politicians don’t actually make their own tweets on Twitter. They either have an assistant, an employee, a small staff, or a PR company, who write and send each message.
It might come as a surprise to some that not every “selfie” posted online is actually a self-portrait taken by that person. A new(?) trend is having someone else shoot one’s “self-portrait” as this provides for more picture possibilities. This probably defeats the concept of a selfie.
Some folks will even use a professional photographer to shoot their selfie. But this is now a portrait rather than a selfie, unless you define “selfie” as being a picture of yourself.
If a professional portrait photographer does a self-portrait, is it a selfie or a portrait? Some of Yousuf Karsh’s most well-known portraits are self-portraits (also here, here and here).