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.
Image posts allow for real estate. Images from link posts show a 154 px x 154 px picture, while image posts can show upwards of 552 px x 480 px. While the maximum size image you can upload to Facebook is 2048 x 2048 pixels, the maximum display size in a photo album is 960 x 720 pixels. So, there is no need to create images any larger than 960Ã720.