Tracking users

"People" seems to like Personas very much and I doubt it divert that many resources from the basics.
IMO messing up the good old interface too much was a much bigger fail in the 'was it really a priority?' department. Not that I personally care about it, I know how to personalize the tool-bars, most of my friends don't (and don't want to) and they don't like what they see as change for the sake of change...

I happen to like Panorama, but yes, it was very strange to spend, apparently, lot of time to implement and QA this feature that almost nobody knows or cares about to the core while removing classical Feed button because not enough people click on it.