you have to explain a little more.
first what project is in question here? not everyone will necessarily be interested if they are expected to promote fraud business (for example)
Also, you should need to give information on what the budget is here. what method of payment and some proof of provided funds (you are a newbie here, escrow is more than recommended)
also, the structure which exactly the social network you want. In the bounty section, you can find how a marketing campaign can look like.