Dentsu-owned 360i is well known for “earned” and social media strategies, but about half its revenue comes from paid media billings, search, and analytics. The agency has solved complex data problems for the likes of Capital One, J.C. Penney, and NBC Universal, and it’s positioning for a future of ballooning analytics requirements. EVP Jared Belsky spoke with AdExchanger about 360i’s positioning, the need for more data in attribution models, and why some clients are taking a “pause” from Facebook — in a good way. AdExchanger: Describe 360i’s media practice. What makes it special? JARED BELSKY: We’re a very balanced agency. Roughly half of our revenue is in media, search, and analytics.  Because we don’t believe you can be…