BuzzFeed's Trump blowup, in 5 stages
What did BuzzFeed do?
CNN published a carefully reported story Tuesday on intelligence officials warning Trump and Obama that Russians were trying to compromise Trump. The basis of this was a 35-page dossier alleging Trump did weird sex things and alleged his inner circle had been colluding with Russia. CNN didn't publish that dossier, because they couldn't confirm the details.
BuzzFeed also had the dossier, and they published it.