Nice thread!
Thor
records and uploads videos on YouTube. I know he gets a decent amount of views and subscribers (for Graal at least).
I think if Graal is free it can get a lot of traffic from the gaming and freegames subreddits as well.
But sites like reddit and slashdot only trend a certain thing for a limited amount of time. If Graal gets on there it won't get on again for awhile because it's old news.
Meaning that we shouldn't focus too hard on doing that until we're sure that the subscription plans and servers can keep people around rather than everyone getting bored after awhile.
Edit: I don't know how much individual players should be trying to advertise though. It should mainly be up to Eurocenter and server staff. However, it's good to pitch ideas about this, since no one really does it very much yet.