Selection bias occurs when the association between exposure and health outcome is different for those who complete a study compared with those who are in the target population. Sources of selection bias. Selective survival and losses to follow-up After enrollment of subjects and collection of baseline data there is
NUMBER OF PUBLIC PHOTOS UPLOADED IN 2013. - 680 million, - 56.7 million per month in average, - 1.86 million per day in average. NUMBER OF PUBLIC PHOTOS UPLOADED IN 2012. - 556 million, - 46.3 million per month in average, - 1.52 million per day in average. NUMBER OF PUBLIC PHOTOS UPLOADED IN 2011. - 575 million, - 47.9 million per month in average, - 1.57 million per day in average.
Top Five Most Watched Facebook Live Videos. Facebook launched live streaming capabilities for all users in April 2016. Creators can now stream content for up to 24 hours, and save the archived video to their Facebook page once the stream is over. According to Tubular, a staggering 3M Facebook Live videos have been streamed on the platform in the last 90 days, generating just under 8.9M views.