In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives. 

The platform is also fundamentally reshaping the way scientists and academic physicians can discover, discuss and _____(1)_____ research. It is not an extracurricular ______(2)_____ to those who participate—it is a critical communication tool. But that change comes with growing pains, and everyone from individuals _____(3)____ major institutions is struggling to figure out the best way to incorporate social media into traditional metrics around achievements.