Cable companies, you've been put on notice. Cord cutting -- ditching your steep monthly cable or satellite bill and instead watching video online -- is on the rise, according to a new report from Experian Marketing Services. In fact, some young adults may never even pay for cable TV in their lifetimes. The number of cord-cutters, which Experian considers people with high-speed Internet who've either never subscribed to or stopped subscribing to cable or satellite, has risen from 5.1 million homes to 7.6 million homes, or 44 percent, in just three years. In 2013, 6.5 percent of households in the U.S. had cut the cord, Experian found, up from 4.5 percent in 2010. What's more interesting, though, is that number goes way up for households that use Netflix or Hulu, the subscription services that stream movies and TV shows online. Nearly a fifth of Americans who use Netflix or Hulu don't subscribe to cable TV.