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by pedoh 5492 days ago
Some of these companies are direct competitors in that how they differ is in their algorithms or the sliver of the market they're trying to "be the best" for. But then you get into the difference between networks, exchanges, DSPs, et cetera, and the differences and relationships between them get complicated. Check this graph out:

http://chrisohara.files.wordpress.com/2010/07/ecosystem_0110...