Pinterest already drives as much traffic as Twitter
The valuation seems entirely justified to us, and one datapoint that goes to showing why is the fact that, according to this chart from Capstone Investments' Rory Maher, Pinterest already drives as much referral traffic as Twitter, despite being much younger and smaller.
Back in January, Mashable reported that Pinterest had become a top traffic referrer for many e-commerce sites, joining the ranks of Facebook and Twitter.