Have you created your Facebook share button code from the Facebook resource page below:
Once you have done that copy the code and paste it in your pages code, directly after the opening <body> tag.
Then add the <div> in which your Facebook share button will appear directly before your Google plus <div> (see below)
<div class="fb-share-button" data-href="https://developers.facebook.com/docs/plugins/" data-width="200" data-type="button_count"></div>
<div class="g-plus" data-action="share" data-annotation="none" data-href="http://www.ottawapatentagency.com/index.html#reaching_out"></div>