... may be I'm a lazy bastard, but none of these is actually shorter.
[youtube] is 9 letters, [/youtube] is 10 letters,


meh.

everytime you want to post a video on youtube,
you type youtube.com
you search for the vid.
copy paste the address, and occassionally excluding the &feature part afterward,
then you come here and manually type youtube twice, with two brackets, plus one slash,

doesn't it irritate you?