If you still like the idea of buttons, but don't want to give up using the vendor-supplied buttons themselves, you can use the "two clicks for more privacy" jQuery plugin[0], which only loads the actual button when the user enables it by clicking a greyed-out placeholder.
I'm also partial to Socialite JS [0] - it provides a similar mechanism, the one I use is the hover option, this negates the need for clicking which I think would confuse some users.
[0] http://panzi.github.io/SocialSharePrivacy/