More specifically, Pakistani ISPs announced YouTube's netblocks, and their upstream provider, PCCW, was stupid enough to leak them to the world.  This caused an outage lasting almost two hours:

This follows a recent story about the Pakistani government instructing all ISPs to block YouTube.  Most likely, the goal of advertising these netblocks was so they could display some "site is blocked" message.

A nice discussion can be found on NANOG.  It's screwups likes these that make me wish all ISPs would use tools like RADb to populate prefix-lists and do sanity checks when allowing customer routes to reach the DFZ.

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