Ninety-five percent of American businesses have nine or fewer employees. But until recently it was almost impossible to find a single source of information about them. Today, that's changing, thanks in large part to Manta, which bills itself as the "largest free source of information on small companies." The Columbus-based website, which launched in September 2005 with a data base encompassing 24 million companies, now covers 64 million -- 20 million of which are U.S. companies -- and was cited in September as the fifth-largest business/finance/news site according to ComScore, recognized within the industry as the Nielsens of the digital world.