Don't forget to use rel=canonical (or specify the page's URL in the widget code) when using social widgets & hash marks (#) to jump to sections of a page. Using canonicalization helps to keep the counts of most widgets (including the +1 button) focused on pages' your main URL, not on the hash mark. (Thanks for the write-up, +Dan Petrovic!)

More on the rel=canonical is at http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394
More on the +1 button is at https://developers.google.com/+/plugins/+1button/
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