This is kind of cool. Facebook is giving small business page owners $500 in FREE Advertising to participate in a month long study. Looks like the all you need to do is us a special Facebook supplied phone number on your small business page that allows Facebook to count your incoming calls. Calls are still routed to your regular number.
Small business page administrators are receiving emails that look an awful lot like phishing attempts but are actually legitimate research by Facebook, which promises $500 in free advertising to those that complete the one-month study.
All Facebook