True, but there is a seed of truth here in how social media has upped the engagement factor so much that it's easy for it to become a time sink with the user not even realizing it. I think society needs another 10 years to absorb the implications of social media and how to use it effectively (and for the filters to get better).
However, I'm sure nicotine and caffeine (not to mention wow) are even worse for most people.
It's a combination of the stimulus and each individual's reaction to it. I'm sure that the vast, vast majority of people have no problems releasing themselves from social media.
I found my way of doing it was simply to block reddit, digg, and slashdot from my /etc/hosts. Otherwise I'd just go back if I was bored ("oh, I have nothing better to do for the next 10 minutes anyways...")