Jaime K Davis
In my previous position, I mostly used our email lists and word of mouth. I added the Facebook page to my email signature, as well as communications I sent out to my customers.
The #1 thing I have found (I agree with the previous post) is having great content boosts participation. For our page, when I would post pictures of employees (and tell them about it), I would get a few new likes. Sometimes I would even get likes from employees' kids, spouses, or parents.