Wait, nevermind - I see where I screwed this up. It was 2010 when ArtForz did the GPU mining thing. It's floated on Slashdot on 7/11/2010 and Artforz starts GPU mining on 7/16/2010. So right after they float it on Slashdot, the first real public mention, people in the know start grabbing up a pile of coins that normal CPU miners coming online from the public can't compete with. Difficulty was at 23 when Slashdot article is mentioned, 45 when Forz started up his farm, and starts increasing exponentially overnight. It's about 1300 2 1/2 months later when public GPU mining is released.
There's this nice spike in number of users right at the Slashdot mention, but they all almost immediately drop off, probably because they can't actually get any coins:
https://blockchain.info/charts/n-unique-addresses?timespan=all&showDataPoints=false&daysAverageString=1&show_header=true&scale=0&address=
But they did pick up a few users in it that are interested in the idea and public GPU mining is released in October. At this point the network is tiny, not much larger than it was in 2009, but the people that created this and few other random people really into this start dumping a bunch of money into GPU's and creating farms.
There's a couple of spikes at various points as well in the early history where you see a bunch users that sign up all quickly drop off, there's probably a nice mention about it somewhere so a bunch of people are interested, check it out, but quickly quit because they can't actually get any coins or mine at profit due to the vast farms that already exist and are run by a very small number of users. They pick up a couple long term users off of each spike, people that are really into the idea and like "freedom", a few people that are technically geeky and already have GPU's, some greedy people speculating on the scheduled deflation, but not too many. And these people aren't getting an appreciable amount of the economy, they're the small time pawns.
Price really starts running up in early 2011, (a lot of the strange RSA movement is seen right around this time), and then it REALLY starts generating some buzz. At this point a very select number of people own all of the coins (and for the most part do to this day) and the difficulty is about 25,000. But it's "rising fast" so people get in on the gold rush creating the first bubble. Difficulty skyrockets to about 2 million. But then a bunch of people get ripped off, their exchange gets hacked, etc, etc and the price starts to drop like a stone. The only people that stick around are some of the people that were mining like mad during the vast run up from early 2011 to the peak. And even about half of them quit (maybe more - the creators certainly have some juice at this point) and the difficulty drops in half almost overnight. Now you have a small, very rabid community of supporters that see a lot of scheduled deflation, like "freedom", or are just kind of geeky - but they only own a miniscule amount of the coins. And you can find a whole lot of cheap video cards on ebay.
And now they're on the map, getting a whole lot of press. Even if a lot of it is bad, that's still press. And people's memories are short, so we just need to keep this thing afloat, with our small but growing community of freedom types, drug dealers and users, online gamblers, tech geeks, speculators, and Jojo's running numbers through mining calculators trying to eek out a tiny profit doing nothing. Until we can create some virtual ATM machines (which we sell), and the rest will take care of itself. Meanwhile we make the price swing a lot so we can shake people's coins out of them while still making money and maintain our interest in this currency.