Reaching target audiences takes work and planning -- especially in social networks. Take LinkedIn, for example. Unlike paid-search ads in Google's or Bing's ad platform, keywords are not used to bid for space. Lisa Raehsler serves up some best practices and tips for using LinkedIn paid-search ads. She tells us LinkedIn uses a cost-per-click (CPC) or cost-per-thousand (CPM) ad bidding system. The minimum CPC is $2 and the minimum daily budget is $10. The best practices include tips on targeting options, ads, and bids and budgets.