I've been following SearchEngineLand, the blog, and recently they posted this announcement from Google.
The Google AdSense blog announced the exact revenue share they give publishers for placing AdSense ads on their web site. In the upcoming months, Google promised to show the revenue share within the AdSense interface reports.
Google broke down the revenue share in two categories so far:
(1) 68% revenue share for content ads, the ads you see on web sites. Meaning, publishers keep 68% of the revenue earned, while Google takes the rest.
(2) 51% revenue share for search ads, the search ads you see for using Google search on your web site. Publishers get 51% and Google takes the rest.
Google said they will not disclose the revenue share AdSense for mobile applications, AdSense for feeds, and AdSense for games at this point, but may disclose those revenue share amounts as the products mature.
Why is Google disclosing this information now? Earlier this month, it promised to do so in response to an investigation by the Italian anti-trust authority see (Google May Finally Disclose AdSense Split … If You’re An Italian Newspaper, That Is). It has also been under pressure to reveal this information not just for Italian ad publishers worldwide — which it’s finally doing today.
Google also said the revenue share of 68% has never changed, but the 51% was less prior to 2005. Google said they “can’t guarantee that the revenue share will never change (our costs may change significantly, for example), but we don’t have any current plans to do so for any AdSense product.”
Staying with social media, Twitter has made a separate announcement regarding third party "feeders".
"We will not allow any third party to inject paid tweets into a timeline on any service that leverages the Twitter API," Twitter Chief Operating Officer Dick Costolo said in a blog post today.
The move, intended to preserve the integrity of the Twitter timeline, will sharply curtail the activities of a number of Twitter ad startups, including Ad.ly, Sponsored Tweets, 140 Proof and Magpie, while giving more prominence to Twitter's own ads, called "Promoted Tweets."