Odnoklassniki just happens to be owned by DST, which is a big investor in Groupon. Groupon had previously bought a Russian clone called Darberry.
The deal makes sense all around. Group buying sites use advertising on social networks a lot to get people to sign up to their services. The deal will probably mean more/better advertising on the site for Groupon and more money for Odnoklassniki. This is also a bit of a coup for DST, which tends to be viewed as just a giant wallet instead of a “value added” investor, but in this case Groupon is clearly getting more than cash out of the relationship.
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