copy/paste doesn't tell you much - here's the text/html content they put on your clipboard if you're curious. Apparently GDocs supports this out of the box, just hides it from the selection box. Which makes sense given that it doesn't support any font.
<html> <body> <!--StartFragment--><meta charset='utf-8'><meta charset="utf-8"><b style="font-weight:normal;" id="docs-internal-guid-8b11d82e-1a25-4b6a-be64-ebdd55b2a698"><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:22pt;font-family:'Facebook Sans',sans-serif;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;">I just stole Facebook Sans</span></p></b><br class="Apple-interchange-newline"><!--EndFragment--> </body> </html>