An anonymous reader writes "Emily Steel at the Wall Street Journal writes about an unexpected twist for Google and Facebook, two companies that make their money selling ads next to content created by others. New companies like Sambreel Holdings are writing slick browser interfaces for popular sites like Facebook or Google and supporting themselves by injecting their own ads into the mix. Naturally, the original ad sellers aren't so happy about other ad sellers inserting themselves farther down the chain. Are we in the middle of an ad war where every company tries to inject their ads over the others? Will only the last 'ad supported' software in the chain win?"