Some possible weaknesses for the key servers supporting the Pokemon Go application, were discovered by a hacking group who shared issue more to create awareness than actual harm to the user community.  

http://www.pcmag.com/news/346190/hackers-we-attacked-pokemon-go-servers

As Niantic rolled out Pokemon Go to 26 additional countries over the weekend, it’s easy to assume the rush of new players was to blame for recent server issues.  But hacking collective OurMine may have also played a part. The group—famous for infiltrating the social media accounts of Mark Zuckerberg, Sundar Pichai, and Jack Dorsey, among others—claimed responsibility for the popular game going offline on Sunday.  As an OurMine member told PCMag via email, the three-person team is “just trying to protect [companies’] servers.”  “We wrote we will stop the attack if any [Niantic] staff talked with us, because we will teach them how to protect their servers,” the anonymous representative said.

According to OurMine, if it doesn’t break into celebrity accounts and knock games offline, someone else will.  Someone like PoodleCorp, which also attacked Pokemon Go servers this weekend via a massive Distributed Denial of Service attack. The group’s Twitter account hints at another invasion planned for Aug. 1.