These are the steps.
01. You order the gig
02. We Add our Banner on the latest Viral article on the website.
03. We spend your gig income (Normally Fiverr pay us $4 per gig) for Facebook advertising on that Viral article.
Your Money spend on your Banner.. We keep nothing. It's a Win Win for both.
For one Gig you will get around 3,000 real visitors from Facebook and they will see your Banner.