Looking at some of the tweets it seems FB has a mechanism that autoflags article links as spam if "too many people are trying to share" it.

This just makes me wonder exactly how automated that feature is, because surely a non-nominal number of people share current event links all the time about something political, sporting event, natural disaster. I wonder if it happens then, or is this a matter of recency....Streisand (there's got to be a better word for it than that) following the news of those 50million accounts being breached.