Why were minorities late to accessing social media sites like Facebook?

This video from 2007 is an interview prominent researcher and Digital Divide expert Dr. Eszter Hargittai did on Chicago Tonight speaking on possible structure issues early on with social media. For example, why early on did more whites tend to use Facebook than minorities? She makes a good point that perhaps the reason why so many minorities were late to accessing social media sites like Facebook is because at one point Facebook was only open to certain majority white universities and colleges and was later opened up to everyone else. Check out the video below:

(via Black Digerati @BlackDigerati)