It's really true though, i've also found my online consumption is inversely correlated with the level of motivation I have for the project i'm working on.

The social media we consume has been very precisely tuned for our consumption preferences. If you're not particularly motivated, you might be inclined to gravitate towards easy to consume media. Social media would likely be near the top of that list. So heavy users, would likely also be the lowly motivated producers.

Amdahl's law pretty much guarantees this will always be the case. There is a fixed time resource and all the work needs to be done in it.