This is where you show that you won't just sit back and take abuse and that you have a backbone. 

I'm sure the urban listings were the backbone of the Airbnb business.

It was not all real estate, but REI provided me the backbone for my cash flow to invest in other businesses as well, which eventually all allowed me to quit comfortably.

Having the backbone necessary to not renew a lease or appropriately raise rents may result in a headache that is not worth the time of getting into real estate investments in the first place.

Agents are held to a professional standard, they should know, they should double check sellers info, especially on investment property where reported income & expenses are the backbone of the sale.

You need to have rules in rentals....rules you make and you need to have backbone when you enforce them.

He moved around to 3 houses before letting some friends stay with him, I had trouble getting them to leave, and I had no backbone then (ive since grown it a bit)I ended up renting to them and as you can imagine when the free ride ended it didnt go well.I've since left the war-zones, and wouldn't consider hiring a squatter.I don't want to invest in an area where this is needed.

Using Craigslist affiliate sites that aggregate rental data and map it with a google map backbone would make that somewhat easy to do.

The retail buyers, the backbone of any true healthy real estate market, haven't entered this picture.

Weekly local meetups or Zooms allow you to connect one-on-one and learn about people and build investor relationships that become the backbone of your investment lifestyle.