Social bookmarking site Delicious (Del.icio.us) was purchased by Yahoo as announced in this release. According to the article, delicious has 300,000 users. While the price was announced, I'll guess it fell in the $6 million to $20 million range, and here is why. Skype sold for $400 per user, which would put delicious at more than $100 million - unlikely. The true value of the user base is probably $5 per person, but I doubt he and his investors would sell for such a "low" price. The price most likely, as Andrew Chen, mentioned to me, depends on whether the investors were angels or VC's. If it was angel money, then I imagine Yahoo got a reasonable deal between $6 mm and $10 mm. If not, then the price was most likely $15 mm to $20 mm. Any higher price and I'll think Yahoo is irrationally scared of Google.