Breaking up Facebook is just a step on the road to rehab for America's relationship with big compani

Facebook should be broken up because it's anti-competitive, and it uses its power to stay that way. It should also be broken up because it's proof positive of an important idea that America turned away from in the 1970s — the idea that size in and of itself can be corrosive to markets. Since the 1970s, regulators and legal scholars have reasoned that as long as a company doesn't abuse its pricing power, it should be allowed to get as large as it possibly can. Facebook doesn't cost users a...