So she maybe has someone to do her tweets for herExpressionless

Wouldn't you? All of Oprah's endorsements are clearly sponsorship - it's not a personal feed.

This is like the popular myth that when a radio DJ says "here's a new song I heard that I thought you'd like" that he means something other than "here's a new song that my editor has decided I should play to you after he had lunch with a marketing exec at that guy's studio and they agreed to pay us $500,000 to play it on our station".