On my personal blog I made a button to disable/enable all the social media plugins. I don't know if anybody uses it (my readership is approximately zero, so no point in tracking clicks or A/B testing), but I figured I'd give users the option out of courtesy.

It does use a cookie to track your preference. The default is to enable them (since most users are not tech savvy enough to know they want them off, and those same users wouldn't easily find a button to turn them on).