After my LinkedIn post, I have been called out by Ali Alpay in the comments.  He asks, justly:

"It
is an "impressive" number, but out of curiosity, do you think it is an
over- or under-valued number?"

I won’t say it’s an under-valued deal,
but for the record, my call is that the VCs in this round will generate
positive returns.  In professional networking, the switching costs are  high.  With the lack of progressive moves in the general jobs/careers area, given the enormous size of the market there (look at Monster’s market cap at $6.2b), LinkedIn will attain a nice segment of that market.  I am a buy!