If you do a web search on almost any topic covered here at InventorSpot, you'll find a series of 'articles' with almost exactly the same wording as one another - which is one reason to come to InventorSpot, because at least our contributors are writing something original, based on a bit of research.
The act of blatantly copying press releases with total disregard for journalistic integrity is known as 'churnalism', and it's way more common than you might imagine. Churnalism is not just restricted to traffic-generating websites; it's something you can find in almost every newwspaper you read.
But how do you know it's churnalism? You could do exhaustive searches online, or you could turn to Churnalism.com. Developed by British independent registered charity, Media Standards Trust, Churnalism.com allows you to paste in any piece of text you feel may be plagiarized, and then gives you a synopsis of how much of that has actually been copied and pasted, and how much text overlaps.
One of the best things about this idea, is that they launched it with a hoax (or two):