Addiction Problems?

So I have several friends who've 'quit facebook' recently.

In a couple incidents - I've asked said friends why, exactly, they quit good ole friendcentral.

"I've just been super-busy.  I haven't had the time for it."

or

"I had to quit.  It was too distracting."

Now, not to judge - but couldn't one just....not log in?

Again, no judgment.  I understand addictions.  I haven't been able to cut it under 3 cups of coffee a day. I understand addictions to facebook.  But, well....

Just sayin'.