You've got to love networking on Facebook--its 21 million users do--and now small businesses can get some advertising on the site for free, according to the Associated Press.

Small-business owners should know that the behemoth San Francisco-based Visa is investing in networking, and becoming one of Facebook's 24,000-plus applications already added to the site in the past 13 months.

Visa Business Network debuted Tuesday on Facebook, and the first 20,000 small businesses in the United States that join will be given $100 in advertising credit to use on the site. That adds up to $2 million worth of free advertising Visa will pump into the small business world.

The hang-out site that still has leaps and bounds to go to prove its advertising worth gets the powerful hand of Visa marketing added to its resume in the new business network's launch.

There, entrepreneurs can swap virtual business cards, connect with the 80,000-plus small business owners already on Facebook and even seal business deals.

One of the interactive elements provided by the network includes a Q&A feature headed by five of Entrepreneur's expert columnists who are there to offer solutions to small businesses. --Elizabeth Wilson