That Facebook page doesn't really say much about them. Their "about" page has nothing but a link to a site that turns out to contain nothing more than ads for other sites. And this is one problem with a lot of this stuff: there is no documentation, without which there is simply no way to tell whether the material is for real or faked.
EVP has the same pitfalls as lots of paranormal stuff: there is always the danger of pareidolia. I am on FB groups for paranormal stuff, and people regularly post photos in which they see the most amazingly detailed images of ghosts and demons and things where I see nothing more than a blur, or even just a clear photo with seemingly nothing weird about it at all. When I ask them what I'm supposed to see they repost the photo with the detail circled, and then I STILL see nothing there!
At other times the ghostly thing seems very clear, but it also seems like it is almost certainly just a reflection in a window or something like that, that they didn't notice until they looked at the photo. Among lots of paranormalists, there is a truly appalling lack of critical thought or investigation.
With EVP I run into the same trouble. For one thing, if you know what you're supposed to hear, even very random sounds will start sounding like voices. I have noticed that when I don't read the transcript, no matter how often I listen to a recording, I simply cannot make out what they are saying (even in those cases where I do seem to hear a voice; in many cases I listen through a recording and hear nothing at all that sounds like a voice).
Here's a rather nice documentary:
I enjoyed it, but I have to say that with the vast bulk of the EVP they eventually play back, I do not hear anything at all out of the ordinary without reading the transcript.
Now there are cases where there is no doubt in my mind that I am hearing a voice. Sometimes I can make out what it says, sometimes I cannot. In this particular case I can make out some of it, and it definitely sounds like human voices. But where is the recording from? Who made it? When? What were the circumstances? Without that information the recording is of no use. I can make my own "EVP recording" with a few mouse clicks.
Assuming the recording is for real, it is indeed a bit chilling, because I get the distinct impression we are listening to a kid being drowned in a tub. Which confirms the notion that some people don't know they are dead, and kind of keep on experiencing the bad stuff that happened to them over and over.
Anyway, I'm reading up a bit on EVP, because I plan to participate in
NaNoWriMo this year and I want to write a book in which EVP briefly features.