Second: everyone wants to look good, and it's easier to talk the talk than to walk the walk.
So you get meme sharing, slogans, and slacktivism rather than real policy proposals. You get guaranteed to fail bills in The House to make Reps look like they're fighting.
Put these together, and at the end of the day, the vast majority of political activity is empty gestures that sum up to <Yay us! Boo them!>