And you thought Obamacare wasn't popular.
Launched Tuesday, the long-awaited online state insurance exchanges were promptly swarmed by millions of people looking to check out prices and sign up for coverage.
But the surge temporarily stalled or froze many exchanges, including the Healthcare.gov portal run by the federal government, which is operating exchanges for 36 states.
Between midnight and late Tuesday afternoon the website had nearly 3 million visitors, many of whom were greeted by a message saying, "Please wait," rather than being connected to pricing information or an enrollment page.
Two million New Yorkers visited the website of their state-run exchange in its first two hours, overwhelming the system. Several state-run exchanges, including Maryland's, delayed opening for several hours, while Hawaii postponed opening for the day.
Still, some people were able to enroll, as many more will before the enrollment period ends on March 31.
Observers said that what federal officials called the "extraordinary volume" suggested that the government-run exchanges may well be on track to achieving the Affordable Care Act's goal of providing affordable, comprehensive health coverage to 7 million or more people in 2014. The volume came even though recent surveys showed low overall public awareness of the exchanges' existence and operation.
(Read more: Obamacare explained)