The 2009 Tour de France, highlighted by Lance Armstrong’s return, may be remembered as much for being the first sporting event in history to fully integrate social media into the competition and the coverage.

Nearly every one of the 20 teams blogged and tweeted (e.g., Garmin-Slipstream and Astana).

Numerous riders and team managers tweeted as well (e.g., Levi Leipheimer, Andy Schleck, and Johan Bruyneel. (For examples of Twitter use by riders, see Dara Kerr’s post at CNET News.)

Active.com combined tweets from all of the participating riders and managers into one stream.

Armstrong, a skilled promoter, was most prolific. In Becky Ebenkamp’s post at Brandweek, Richard Rosenblatt, CEO of Demand Media, which owns the Livestrong.com community, said, “(Armstrong) called up and said, ‘I … want to broadcast through Livestrong.com exclusively and use Twitter to make sure people can not only see the tour, but actually feel it and hear it directly from my mouth — unedited.’”

His Twitter and Facebook posts regularly included behind-the-scenes videos and photos. A skilled promoter, he leveraged his celebrity and his celebrity friends to raise awareness for Livestrong, such as a video of Ben Stiller clowning on Lance’s warm-up bike.

Traditional sports media relied on Twitter for leads. The Daily Mail published Lance’s Twitter diary. And while many of the riders’ posts were banal, some provided real insight into the action, such as this comment by multiple-stage winner Mark Cavendish, “Yesterday with 3km to go, Piet Rooijakkers (skil shimano) kidney punched me.”

The official Tour de France site included a fantasy team competition as well as blogs and Twitter.

Versus.com, the site of the TV network which broadcast the race, incorporated a dazzling array of fan-friendly features, including live coverage, mobile alerts, daily blogs including Armstrong’s, a message board, a widget providing updates, podcasts, an ask-the-expert feature, a serialized graphic novel, a sweepstakes, a virtual library of video and photos, trivia quizzes, and games.

One of Armstong’s sponsors, Nike, donates proceeds from the sale of Livestrong products to the Lance Armstrong Foundation. Its  tour site provided visitors the opportunity to post their own stories in words or video of hope in the face of cancer.

It also featured an ingenious innovation — the Chalkbot. Messages of encouragement and remembrance, texted by site visitors, were spray-chalked thousands of miles away on the roads of the tour during the event by the Chalkbot. Who could resist memorializing a loved one in this way?

The 2009 Tour was perhaps the most connected athletes, teams, sponsors, charities, media and fans have ever been. Where do you think it will lead?