The Kardashian clan might be getting serious about taking a step back from social media. Kendall Jenner's Instagram account vanished over the weekend, but her 68 million followers on the picture-sharing app can still keep up with her comings and goings via her Facebook and Twitter accounts. Jenner is the 21-year-old half-sister of Kim Kardashian. Kardashian has largely disappeared from social media since being held up at gunpoint in her Paris hotel in a jewelry heist last month. Khloe Kardashian called the robbery "a wake up call'' for the family. Jenner also encountered a scary situation this year. A 26-year-old man was convicted last month of trespassing at Jenner's Hollywood Hills home in August. Jenner testified that she was frightened when the man followed her car into her driveway.