Recently there was a discussion on PerlMonks whether to add FaceBook "like" buttons or not. tye said "there will never be a standard facebook button on PerlMonks so long as I have any say". None of us is crazy about putting other sites JavaScript or even images on their site unless it is 100% necessary. On the other hand the social networks and in particularly sharing is important.
What about following solution (already implemented on the right side of this page)? After clicking the link "If you like it, share it.", the page element is replaced by different sharing site links which lead to current url submitting.
(Kudos goes to sixtease and his project csobo for the enormous list of share links.)