"We have one of the largest ad businesses on the Internet today, " Tim Armstrong, CEO of AOL Inc. (NYSE:AOL), told The Deal Thursday. We spoke with Armstrong on the floor of the NYSE Euronext moments after he rang the opening bell to celebrate the company's first day of public trading independently from Time Warner Inc. (NYSE:TWX). In the video, Armstrong discusses AOL's quest to deliver the "world's best content" (a new tag line for the company used internally but not usually shared with the public, he said. He also talks about the fierce competition he faces for online advertising dollars against big guns, including Google Inc. (NASDAQ:GOOG), Microsoft Corp. (NASDAQ:MSFT) and Yahoo! Inc. (NASDAQ:YHOO), and scrappy startups, such as Twitter Inc., Yelp Inc. and Foursquare Labs Inc. For more on the challenges AOL faces, see "AOL flies free; Can content keep it aloft?" on Dealscape's sister blog, Corporate Dealmaker. Watch the video below or download it on iTunes. -- Mary Kathleen Flynn