 VideoSift has a policy of "no self-links", which means contributing videos that the VideoSift user ("Sifter") created themselves.In addition to functioning as a means to prevent astroturfing, it allows for an extra step of "sifting" - a third party must first approve of the video by selecting it for submission before the original creator can cast a vote for it.In response to Sifters' desire to showcase their own videos, occasional "Siftoffs" have been held, with the first in May 2006.