Best strategies for advertising real estate services

[Timothy Church]

A quick question for all those who offer services to others within real estate. I currently own a vacation rental management company and we've had great growth from 15 units to 75 in the last two years. Up to this point it has just been word of mouth or existing clients for growth. Now I'm looking to move things forward and start actually advertising.

Has there been a particular medium that you have found good luck with for advertising services? I'm working on trying to get my head around Facebook ads but I haven't got it set up properly and it is going out to a rather broad market. Should I focus on more direct marketing such as mailers to existing vacation rental properties or maybe going to more meetup to interact with other investors? 

Just was curious if something has stood out for finding real estate investor interested in services.