My favorite place to find renters by room is the local Facebook for rent pages.

@Michael TotinoOnline ads (Facebook, google adwords etc.)

The odds of there being an accurate, thorough list somewhere are slim to none, though you might get some decent info from a regional STR owner's group (there are lots of these groups on Facebook).  

There are other people that help me moderate the Facebook page so I don't always see the requests and sometimes they are denied for not answering the questions completely or not being invited by an active member. 

Hey Rudi,I do a lot of rent to owns and this is how I find all of my tenants (for free):1) Put a sign in the front yard (you can hand make this it doesn't need to look fancy - use marker or whatever you want)2) Tell all the neighbors what you are doing and tell them you will let them pick their neighbor if they bring you someone that can afford it3) Join every "Buy, Sell, Trade" group on facebook for the city your property is in and post an Ad in them as well as the facebook marketplace (this is my #1 source of rent to own tenants - got me over 500+ people apply through that)4) Craigslist5) Zillow (this will post it on Zillow, Trulia and Hotpads)6) Mortgage Brokers in the city the property is located in7) If all the above fails - then either you didn't market long enough, you didn't repost the ad's weekly or your price/monthly is too high so try lowering it and re-marketing the property.I've never had a problem filling a property using these methods.

Now the Joneses are on Facebook putting their 'successes' LOL in your face. 

I can't seem to get a hold of anyone via the Bigger Pockets Facebook page, or via email.Does anyone have any suggestions?

Either marketing to current/past customers to get your networks to work for you or do external marketing - google ads/ facebook ads (I'm just starting).   

Putting good content on Facebook, Instagram.

Hope this was helpful and I look forward to your responses.If you’re ever curious about getting plugged into the WA or PNW investing scene, I would like to extend an invite to have you join my Facebook group with about 3500 members.