Social networking sites like Facebook, YouTube, Orkut and twitter are among the most popular sites on the internet. Users of these sites form a social network (SN), which provides a powerful mean of sharing, organizing, and finding contents and contacts. However, the rate at which SNs are growing, posses many latent challenges in maintaining the stability of their underlying systems and the members associated with them. We discus some of the current challenges associated with these emerging SNs; In particular the challenge in the analyzing of large scale SN data, challenge in developing the tools and techniques required to extend these large scale SNs, and privacy issue related to SNs.
