Because over the exact same time span Facebook has been rolling out Suggested Posts, it has also been tightening the controls on Newsfeed, making it harder for many page owners to disseminate their messages without paying to promote them.
Like Chrome, it breaks tasks up into different processes, but instead of separating at the page level, Gazelle breaks individual page elements into different processes, allowing content from different servers to be isolated and ultimately providing fine-grained security controls.