Prew, I don't think it's too late. I didn't build a community at all and launched in the worst month to launch (according to the study found here). I still managed to get the game funded.
Vigilus, yeah, actively advertising every day is very important! Even if people yell at you haha.
AllShapeUp, thank you and good luck with your project
Fb was a good way for me because I have a partner with a big website. But over 1/5 of my backers came because their friends recommended the game to them. So, at the end of the day, you just need to have a good product, I guess