I would like to know which sites are reliable to do some market research on population growth, and income on zipcodes, and counties in Delaware.

Steel site.

You're not on site or within driving distance and even with a property manager, lots of things can happen. 

I've butted heads with mods over various topics, to include what should/shouldn't be allowed on the site.

Don’t leave anything to chance—guide the visitor to do what you want, which is to click YOUR ad and leave their details on YOUR SITE.

its a great site to learn and get back into the swing of things. 

We take it a step further and build in factory then deliver the units to the site.

Almost every host has experienced it, a high maintenance guest that you go the extra mile for and reports nothing wrong during the stay, but then posts a hyper critical review as if they are Gordon Ramsay reviewing a restaurant.I have always opted to just not post a reply, especially since we have over 50 great reviews on both sites.

Airbnb does actually have a host meetup portion of the site but I have never used it. 

That just tells me real estate must just be a safer bet than dental offices from an investors perspective, which is great as I'm moving away from dental.