ya, the new facebook stuff is... weird.
Personally I don't care that other people can see it. If someone really cared enough to stalk me online they would already know when I left a group or added a new friend. But reall.... who cares enough to want to know everything I do? It just seems stupid and pointless. Not to mention I hate how it looks.
And I am already a member of "Students against Facebook News Feed (Official Petition to Facebook)" and a couple other similar groups. But ironically I wouldn't have known about it without the News Feeds... although, without the News Feeds I wouldn't have needed to join the group.