It would take me many years to write over 10,000 top 3 worthy articles. Id suspect the new Penguin quality checks might have taken a nip at your traffic before I'd suspect social buttons. Even if your pages were all top quality it's possible that the pages linking to yours weren't. Have you checked your backlink profile in GWT?
You could always try removing the features and seeing if you rebound but I doubt that was the cause. Triple check everything else before removing them, imo.