Someone who habitually stalks people who post videos on You-Tube. They watch their videos so much that they feel they know them personally. Leading to attachment and stalking this person, his/her channel online, other videos related to this person. Serious cases can lead to stalking this person on twitter and facebook.
"OMG Sally, stop you-tube stalking Justin Bieber!"
"I'm such a YouTube Stalker! All I do all day is watch Nigahiga videos."