According to the infographic from Wikibon below (and originally posted on the Built In Chicago blog), Chicago has two of the largest data centers in the United States. 

The Business Marketing Association (BMA) of Chicago Young Professionals and Chicago Young Professionals LinkedIn Group are co-sponsoring a "Social Media Mayhem" event at Google's Chicago office (map). The event will be held on Thursday, February 9th. 

The event will feature B2B marketing leaders from Aon and IBM who will talk about their individual social media successes. It is also a chance for attendees to discuss opportunities and challenges of social media in the B2B space, ways to use social media for career advancement, and meeting and networking with local marketing professionals. 

You can register for the event here.