Dta for: Dual Effects of TL in We-media Videos（308+2670）

In order to obtain accurate data on the time length of videos, it is necessary for investigators to measure customer satisfaction and participation by providing videos of different types and different time lengths as stimuli, so it seems that a rigorous and complex experiment would be inevitable. But fortunately, Bilibili has in fact provided a large number of videos of various types and time lengths, which are attached with relevant and reliable data (with a large enough number of views), hence can be considered a natural experiment of this research.