If you've made $109 from 800 unique visitors, that really is very good.

I have tried social bookmarking (I used reddit), and managed to get a lot of visitors to my blog (about 4500), but only 8 actually clicked on ads! Admittedly, the ad placement wasn't that great at the time. But also, the type of people who come from places like reddit are too savy to click on ads.

Can you say which social bookmarking site you used?