There's no official advertising anymore like how it was done on Facebook, Tektek, (and DeviantArt too I think) as it costs money and doesn't really bring in enough to make it worth it (not to mention bringing in trolls if advertised in the wrong place).
So any "advertising" is really done by the userbase in terms of getting our name out there and letting others know we exist. We even have these banners (Click here) for it.