Maybe it is an area thing. a few years ago I did a few face book adds , and a couple of village /town groups free adds.
I found it to be an absolute ball ache.... people messaging silly times with silly questions , and back and forth messaging of an evening.
80% turned out to be messers . fortunately I always charge extra for first clean so I wasn't out of pocket.
I do have a face book business page , and have had a few nice jobs from it.
I also have picked up a few jobs on face book from recomendations which is always nice .
I have a job tomorrrow cleaning a supermarket building . its those "sidings " surfaces . ( I think thats what its called ?)
I will put pics of this on my face book page .
For bigger "one off" jobs its always worth a punt.