At their Q3 earnings call at the end of October 2013, Facebook announced that 48 percent of users on a given day are only accessing it from mobile. Nearly half of their revenue was also earned from mobile ads as well. Given the trends, those numbers will be significantly higher by the time you read this.
What does this mean for you?
It's not only crucial to consider how your content looks in mobile feeds, but you should be catering content specifically for those platforms. Small screens on mobile devices encourage users to scroll through their streams of info at an ever increasing rate. Keep your message simple, straight forward, and intriguing. Short copy and large, attractive photos are a must.