This seems no worse that than Facebook's advertisements (slightly less freaky in fact). All it shows is that you endorsed something, who cares? They already have your data all they are doing now is saying "oh hey your friend +1'd this"
I agree. The only problem is when it's done fraudolently. Just two weeks ago I was somehow added to a random Facebook event in another country; I think it might have been done with click hijacking.
I failed to see how my choice to endorse something publicly (which is what a +1 is) makes Google "evil". The whole idea of +1/Like is to show approval/agreement. The keyword in that sentence is "show".
