I launched a baby book computer engineering for babies. I have posted about it a few times on Hacker News & Reddit, and that was enough several thousand dollars through kickstarter.
The kickstarter campaign probably brought in about 150k with minimal marketing effort, and at around that point, I brought on an ad agency that juiced it up to $250k after that.
I'm continuing to do preorders through my website, but all of the pre orders I get now are mostly driven by facebook ads.
Thanks for letting me share!