How sorry is Yahoo that it let Facebook get away last year, after a reported $1.6 billion offer proved insufficient? Sorry enough that the Internet giant is now using a Facebook group to tout Yahoo Mash, its new social network that's currently invitation-only. True, the invitation was extended to members of Yahoo Pilot, a group dedicated to exploring new technologies, so it's not entirely misplaced. But it's telling that Yahoo's so unconfident in the promotional powers of its own properties — anyone remember Yahoo Groups? — and so conscious of its lack of regard on its home turf of Silicon Valley that it's depending on Facebook to get the word out.

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