Airbnb called rival Vrbo 'desperate' for putting a sarcastic billboard outside its office

Courtesy of Outfront Media

• Vrbo put a billboard outside Airbnb's San Francisco office saying it is "cooler" and "friendlier."
• Airbnb called the ad stunt "desperate" and said the campaign just gives Airbnb "more visibility."
• One advertising expert told BI that while confrontational ads can work, she isn't sure Vrbo's did.

Vacation rental company Vrbo took a swing at its main competitor, Airbnb...