The brainchild of former University of Chicago graduate student Andrew Mason, the company has grown rapidly since it was founded in November 2008. It received $1 million in seed money from Chicago technology entrepreneur Eric Lefkofsky and now has more than 13 million subscribers in 29 countries, and over 1,200 employees worldwide.

This year, it raised $135 million, much of it from Digital Sky Technologies, the Russian investment fund that backs Facebook and games company Zynga.

"We are focusing our people and capital on markets with the largest return on investment and these markets represent a tremendous global e-commerce opportunity for us," Rob Solomon, president and chief operating officer, said in a statement.

DarBeri operates in Moscow, St. Petersburg, Nizhny Novgorod, Ekaterinburg, Novosibirsk, Perm and Kiev.