Jeremiah Cornelius writes: WalMart — the retail king of Big Data analytics — will be meeting Mark Zuckerberg for two days in Bentonville, to "deepen" their relationship with Facebook. The CEO-level strategy summit is intended to bolster the relationship between the world's No. 1 social network and the world's largest retailer. WalMart has been left in the dust online, by the behemoth Amazon. An alliance may be poised to challenge this dominance, particularly in light of Amazon's planned foray into same-day delivery, nationwide. The companies share James Breyer, who sits on the boards of both Facebook and Wal-Mart. Adding another angle to this, Yahoo's new CEO Marissa Mayer was elected to Wal-Mart's board in early June, while she was still at Google. Earlier this month, Facebook and Yahoo settled a patent dispute and announced plans to form another "strategic alliance" involving advertising and distribution. The implications for online privacy in this series of relationships are uncertain.