Good luck, but this isn't going to be an easy task. It will involve a lot of work, and even some money. Hope it goes well
$15 from social bookmark is really good money. if you say about adsense. i think $100 will be kinda hard, if u dont get huge traffic. but hey good luck, also share some tips with us, if u want.
I have a social networking site and the returns are low. like you say, about $3 per 1000, (if not less). It takes a fair bit of effort to get the punters to come and visit your site and comeback. FFMG
dating sites are good anad bad for making money with adsense, its good because you have returning visitors whcih is key in business, and its bad because clicks are no more then 10 cents, so it will take alot of time to get people to actually trust your site and join and to build a big network will take time and updating your site every day.