HAVE YOU EVER HEARD...THE DIFFERENCE BETWEEN A GEEK AND A NERD

This question came up frequently at Dragon Con- What is the difference between Geeks and Nerds? And more importantly, which am I? You see, the whole fan and gaming culture is about fitting in. As a Star Trek fan for example I need to know basic helm jargon such as 'warp factor', 'dilithium crystals', 'M5 planet', and the correct response to 'live long and prosper'. Knowing these random facts help you have an intimate conversation with other fans over the things you know and others don't. This same connection can be made on a broader scale by self proclaimed nerds and geeks. This sect of people can bond over the fact that they have bizarre knowledge and interests, and it doesn't matter if it's the same interest. Hence the creation of Cons.
From that long spiel you can deduce that what both geeks and nerds have in common is a vast repertoire of knowledge and obsessions. With this similarity, what is the difference? The most obvious difference is that geeks have a fandom and nerds have a field of study. For example, a nerd may have some down time and decide to read a medical dictionary or practice surgical knots. A geek on the other hand would use his or her spare time to watch the Lord of the Rings trilogy and buy a membership pass to ComicCon.
In an interview for DragonCon, Sandeep Parikh (who plays Zaboo in 'The Guild' webseries) said this little bit of wisdom-

"If you're a nerd, it's because you know something. You're a nerd about that. But if you're a geek about it, that means you just love it." CNN

Sure this quote is a bit biased against nerds, but it speaks to the general point that nerds are knowledge seekers and geeks are pleasure hunters (which sounds more sexual than I intended).
Of course, there is the general tendency for geeks and nerds to overlap because people who are into technology and fandom usually also have a periodic table shower curtain and possibly multiple photos of scientists around their home. It tends to be that most nerds are geeks and dorks and dweebs (if you want to get all 1950's). Here is a nifty ven diagram to explain the phenomenon. As you see, nerd is in the middle encompassing all three components of obsession, intelligence, and social ineptitude. I don't mean to seem nerdist with the socially inept comment, but really, who can have that level of dedication to academic knowledge, fandom, and a social life? True?

If you're not sure where you fall in this diagram, how about taking a quick test? Nerd?Geek?Dork? I'm a cool nerd :D