How "because" became a preposition

Just when you think you've gotten the hang of this grammar thing, somebody goes and changes it. From the Atlantic's Megan Garber comes news that linguists are accepting a new role for "because." Garber says you can blame the social media culture's affinity for efficiency and irony: "I'm late because YouTube. You're reading this because procrastination. As the language writer Stan Carey delightfully sums it up: '"Because" has become a preposition, because grammar.'"