Two titans living in sin?

Select terms of the search deal that Yahoo and Google struck on June 12 were revealed on Friday.

The SEC filing from both companies states Google will supply Yahoo's search system with ad services (via AdSense), but did not disclose any financial terms — that is, how they plan to split the revenue was not defined.

The partnership was billed as "non-exclusive," meaning that Yahoo can contract other ad services, Reuters reports.

But critics points out that the partnership, a kind of unofficial marriage of two web search giants, empowers them to charge higher prices for weaker services.

The contract is also eerily silent about how the sharing of user data between them will affect the privacy of Yahoo users. It also fails to elaborate on "other business opportunities" that may arise from the partnership, exclusive or not.

AdSense revenue will no doubt skyrocket, and the addition of Yahoo will give the Google AdWords platform a whopping 90% (vs. the current 70%) share of the online sponsored search market. Some tears will be spilled over the fall of Panama, given that the deal will cause Yahoo PPC rates to increase by about 22 percent.

Yahoo reportedly expects to increase its revenue by $250-$450 million in the first year of the deal, which may finally give its shareholders something to smile about.