In late September, Google announced it had been gradually rolling out Hummingbird, a completely new search algorithm. The algorithm emphasizes semantic search and focuses on understanding the meaning behind the user query rather than simply trying to match instances of words in its Web index. This significant change in the core underpinnings of search has a lot of folks wondering about its impact on their business. (When combined with the recent spike in Not Provided, it makes for a pretty nail-biting time in the industry.) The scope of this change has many search marketers wondering how Google makes such a change. More specifically, how does Google measure “success” in their algorithm changes? Get the full story at Search Engine Land