The true video watching time on Facebook

We know that Facebook censored data by neglecting watching times shorter than 3 seconds. In order to see the impact of censoring on the average watching time, we must assume a probability distribution for watching time. If we assume that the watching time $X$ follows an exponential distribution (though this seems to imply that videos can be watched for an infinite time, it serves just as a model since the probability of watching time exceeding a physically feasible value can be extremely small), the average watching time $\mathbb{E}[\hat{X}]$ computed after censoring durations shorter than 3 seconds is, quite simply, the true average $\mathbb{E}[X]$ value plus 3 seconds.