Put together one company with a large but declining business and another with a larger but declining business and you get ... AOL and Verizon, which last week tied the knot in a $4.4 billion deal that left people wondering if they ever got around to closing their dormant InstantMessenger accounts. Verizon Chairman and CEO Lowell McAdam is buying AOL for $50 a share because he figures the media company, which shed its "You've got mail" roots long ago, has some advertising technologies that can help Verizon's smartphone-based video business.