I have experienced this same problem when I reinstalled a theme on my page and the social network sharing buttons had gone. I had the set up as a minimizing side bad on the side with just a small button showing all the time.
If you have encountered the problem, you might want to re-install the old settings back and take note of what has to be changed in order for it to work. You might have problems with the share function after but that would easily be fixed as well.
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