Q.1952

A tweet by this celebrity in Jan 2016 read:

Eat bread. Lose weight. Whaaatttt? #ComeJoinMe [...]

Containing a link to diet company Weight Watchers (in which she has a stake), this tweet is said to have influenced its share price going up by 20% by the end of that day.

Which influencer?

[+ Show Answer]

Oprah Winfrey. More here.