“Despite Twitter’s erstwhile reputation as a soapbox for ephemeral thoughts (i.e. “long line at Starbucks…argh!”), the data tells another story: as a platform, Twitter refers among the most engaged video viewers out there.
One possible reason for this might be the fact that the service allows one-way following, which means everyone’s feed is hyper-customized, with less noise caused by needless “friend” reciprocation or, in the case of Digg, a crowded homepage. This way, if someone links to a video from Twitter, there is already a built-in selection bias.”