Hello I was creating some videos to promote my services using youtube. One of the videos was in first page the day before yesterday but now is in second page. The title is eight words so it is easy to rank at least in first page. I tried to find the ranking factors but nothing. Could somebody tell us which are these factors which affect the ranking in youtube search engine? PS: If i use traffic exchange sites trying to have views less than 7% of the whole duration of video, comments and likes may i cause problem to rank my video or it beneficial for my video ranking?