You're writing that reply for future guests to read.Some hosts may think this is tacky, but I have one of these magnet signs from Etsy on my fridge. 

I think it's a matter of having an understanding of what you can do with FB, choosing a strategy, then executing that strategy.For instance, I create an ad offering a lead magnet (something of value someone gets in exchange for an email address), it takes them to a landing page, and then I place them on an automated drip campaign focused on getting them to respond for more information or an in person appointment. 

However if you are looking for a more magnetized resource for passive income, I suggest reading the four hour work week by Tim Ferris!

And I include my "I buy houses" fridge magnet, and have received calls many months after the mailings. 

Criagslist, bandit signs, car magnets, letters/postcards, local REIA meetings.

If it takes the average person 3-7 times of seeing the same message before they respond then try to make it happen.1) Put bandit signs in the area that you are targeting2) Send a post card3) Drive around the neighborhood with magnets on your car4) Put flyers or sticky notes in the neighborhood5) Place an ad in the cheap newspaper6) Post on craigslist7) Create a webpage that ranks well8) Call them, after finding phone numbers by doing a reverse (address) lookup on AnyWho or WhitePages9) Knock on doorsThe point is, get creative, and get your message out there.With the limited budget you have I think you should focus on that one neighborhood.

They tend to shop around their deal to all of the other local investors when they use the internet.Not many calls from car magnets.

I also understand the concept of risk/reward and this actually is the most powerful "magnet" for REI for the rewards are significant if you are willing to do the work.

With 6000 pieces I spend $4680.Doing it myself, including magnets, costs about $3,000; without magnets it's about $2,000.

Most guys with pickups and magnetic signs don't have insurance, heck, they may not have a license!