Facebook accounts for 25% of Vodafone's European web traffic

"Given that one quarter of all Vodafone’s European web traffic comes from just Facebook, it would mean Colao giving up a potentially huge chunk of revenue at the same time that he and the other mobile companies are having to invest billions in new phone masts and faster 3G and 4G networks around the world."
Source:  Evening Standard, 26th February 2014
NB - I'm assuming that this means 25% of web traffic that Vodafone carries is for Facebook, not 25% of the traffic that arrives at Vodafone.com comes from Facebook