The poster is the founder of scribd doing subversive marketing for his company. Guessing that is how he knows they are profitable.

How does the quantcast measurement not measure growth? Note it goes up and to the right...???

I think they mean that it doesn't show anything about revenue growth or profitability. When we talk about a company growing, you usually think of either revenues growing, or the head-count growing.

What the quantcast measurement does show is the usage of Scribd is growing. And congrats to them on that!

I think the gp had tongue firmly in cheek.