Most need proximity to the city. 

I actually have a fee in my lease if a tenant wants me to physically pick up a payment.

From what I’m seeing, it looks like (and should continue to look like) the clay, Cicero, and Liverpool areas are expected to get some of the higher appreciation in the coming years due to close proximity to Micron (Zip Codes 13039, 13041, 13088, 13090).

Tax benefits, use of leverage, and a physical asset that you can see and touch.

You must keep the tenants security deposit at a bank that physically operates a branch office in the State of NC.  

Vacation rentals are usually much nicer, are close proximity to attractions (beach, mountains, lake, theme park etc) and have nicer or more ammenities.

It was vital that the house be in close proximity to the one who knew how to do the repairs, because of the technology of our current time theoretically Id be able to monitor and track progress with a trust worthy foreman whos on the job, performing repairs, managing subs, and moving the needle.

Jaco Beach, known for surfing and close proximity to the San Jose airport started new construction projects, that will require an increase in the variety of activities for the tourists.

If im out of state, does it make sense to join social media groups, etc. to accomplish the same thing without being physically there? 

I look for liens that will be removed or that may stay, ownership history, platting, zoning, exit strategies, cost & profit analyses, and above all else; I physically look over the property.