Been doing this on two different businesses for about 4 years. What happens is, at the start, you get a lot of work from it, as you're new and members on pages notice you. In the first two years advertising in about 10 local pages, we'd get at least 500 to 1000 quids worth of work from this type of advertising. As you go on, the people tend to "take it all for granted" sort of thing. So we had to find new groups and pages. Works well, as it's free advertising. You post something like:
We have been in business since April 1989 providing a window cleaning service to the following areas: XXX,XXX,XXX and XXX. Fully insured and tax registered. If you would like to be added to the service on a 5-6 weekly basis, please let us know by phone 05221 349 25 or by e-mail
info@rpg-service-herford.com.
Or join our group for future reference.
http://www.facebook.com/BFG.Window.Cleaner
We've never used the Facebook boost thingy, and their offers, we just post this sort of thing. Getting your picture done like that meme I've posted is easy. If you need any help with that meme, I'll post the link.
HTH