In fact, I have more than 50 responses to a query I put out about successful use of Facebook ads and have a future post to help small companies use it more effectively.
During their earnings call, the social network reported 618 million daily users accessing Facebook on their mobile phone, out of a total 1.1 billion daily users (I suspect some nice rounding errors there), but how people useFacebook on their mobiles is different to the desk-bound usage, and reduces their value to advertisers.