The Consumer Electronics Show this week is expected to feature more tablets to compete with the Apple iPad, left, and Samsung Galaxy Tab, right. Gero Breloer/AP hide caption

itoggle caption Gero Breloer/AP

Even though Facebook remains wildly popular, a number of startup social networks are trying to woo people with the promise of better privacy controls. Nicholas Kamm/AFP hide caption

itoggle caption Nicholas Kamm/AFP