Reminder: even if cannabis is now legal in 23 states, including recreationally in some, Facebook does not want you posting about it on its website. The BBC reports on its recent crackdown on accounts and pages set up by legal dispensaries and weedy websites.

So what's the logic behind the move? Well, although the drug may be legal in some places, it's still very much illegal for others. That creates a tough dilemma for a social network like Facebook, which is used by people all over the world. Facebook's "Community Standards", which users agree to maintain when they sign up, tend to take one standard global position on issues like the promotion of drugs. When BBC Trending contacted Facebook, they issued this official statement: "In order to maintain a safe environment on Facebook, we have Community Standards that describe what is and is not allowed on the service. Anyone can report content to us if they think it violates our standards. Our teams review these reports rapidly and will remove the content if there is a violation."

The wave of shut-downs was noticed last week, reports NBC News.

In New Jersey, where medical marijuana is legal, three of the state's five dispensaries, or Alternative Treatment Centers (ATCs), they're called, had their Facebook pages shut down last week. Breakwater Alternative Treatment Center, Compassionate Sciences Alternative Treatment Center (CSATC) and Garden State Dispensary all received messages from Facebook stating their pages had been "unpublished" because content posted on their pages "doesn't follow the Facebook Terms."

The delicious part is, of course, inconsistent enforcement: it appears that weed sellers are grassing one another up to Facebook.