A recently-released study from Simply Measured found that a study of the Facebook Fan Pages of 15 early adopters from a variety of industries realized 46% more engagement per post with Timeline. Another study, by Vitrue, found that some brands have seen as much as 190% lift in engagements rate per fan. It noted a reduction in the engagement rate by 52% when the timeline shift was made.
However, 27% saw greater than a 20% increase in engagement rate (includes likes, comments, etc.) when implementing best practices for brand pages. Read the rest at Marketing Vox.