Lots of indie game developers assume that their game will be so unique/fun/innovative/etc. that the world of social media will take care of marketing for them. This plan may work for some games, but if you’re banking on social media to carry your game far and wide you should think again.
The world of the social web is getting more complex every year and recently this image has been making the rounds that outlines the social media categories and networks.
Oddly, I found this on Pinterest and it’s not even included in the image.