Snapchat is shifting its focus from growth to monetization through advertising. It has hired an executive to help with an IPO and wants to be valued at $1 billion by 2017. There are two types of Snap ads: ads between stories and expandable ads that take users off the platform. Research found Snapchat ads have high engagement levels, though it's still early to determine their long-term success given they are new and targeting existing Snapchat users. The ads are seen as unobtrusive since they are limited to 10 seconds and users can quickly swipe past them. An example Taco Bell lens was viewed 224 million times, showing how ads can be engaging for users on the platform.