QUESTION: If you want to get a promotion at work, there's something you need to be doing.

A third of the people who started doing this got a promotion within 6 months!

What did they do? 

HINT (given on day two of asking the question): This is something you most likely will be seen doing in the breakroom (kitchen) at work.

HINT#2: It is beverage oriented...

ANSWER (received 25 hours and 58 mins later): Drink coffee from a mug with the company's logo on it.