Morning Update: Ad agency Post-it wars; Facebook adds video ads; Twitter to expand 140 characters

Ad Week: Agencies on Canal Street Are Waging a Post-it-Note War, and It’s Awesome

That was early last week. By the weekend, a full-blown Post-it note art war had erupted on Canal Street in New York City, with a number of agencies participating—including Havas Worldwide, Horizon Media, Cake Group, Biolumina and Harrison and Star. (Update: Getty Images has also been involved.)

On social media, the posts have been tagged #canalnotes and #postitwar and have been flooding in. It’s a wonder any client work was getting done at these shops last week. @LishKapish has been among the better documenters of the whole battle—posting photos including the one at the top of this post, taken Monday.

Facebook: Audience Network will now offer brands pre-roll, mid-roll and post-rolls video ad slots