The conspiracist in me would be worried if a website like that gained traction and manifested noticeable changes... you know what they did to Black Wall Street and that neighborhood in Manhattan that had a significant population of Af-Am homeowners.
That said, I'm not too far off from the Eatonville area in central FL, a city with strong historic, cultural relevance. I often think what would happen if middle class/upper middle class black people took a look at the area and the lowered prices of (some) homes here, and thought about gentrifying the area as a group before that place gets Harlem-ed.