Katie Couric will be anchoring a post-Evening News Webcast on Wednesday night, on the 100th day of Barack Obama's presidency.

Mashable writes about how she wants you to get involved.

Couric is asking people to submit a 20 second video to her Facebook page, explaining what Obama has done right or wrong while in office so far — some videos will be included in the Webcast.

"She's doing a fantastic job combining her star power with social media savvy to raise her profile on Facebook and grow the CBS audience through potentially viral channels," writes Jennifer Van Grove.

Click continued to see Couric's "challenge" video...