My idea is to start an online/ mobile app platform that would allow younger people or people with smaller amounts of money they’re willing to risk in an investment to crowdsource properties in large groups and collectively buy properties outright.

Glad to have you in this platform.

I'd just recommend using as many listing platforms as you can.

The new focus for short-term rentals is building your own brand outside of the Airbnb platform anyway.

It's exciting to have owners, investors, residents, students, etc all join this great platform – in order to grow in whatever their area of interest is.

In addition to the platforms you mentioned above, check out Wanderly and Furnished Finder as well for popular medium term rental sites.

Any thoughts on using investment platforms like Roofstock and crowdfunding platforms like Fundrise as an investment strategy?

But yes I’m gonna be posting a lot on this platform for feedback this app is amazing

Message me for more details on our platform we use for uploading leads. 

I doubt the stem is plugged but if it is, it would likely be build up over time.