MORE SNAPCHAT SECURITY CONCERNS: A security researcher found that he could run a program that sends so many messages to a Snapchat user that it crashes the recipient's iPhone (it doesn't appear that he tested other mobile devices). The security hack is what's known as a denial of service (or, DoS). DoS attacks attempt to overload a server with thousands of requests in seconds, which can cause the entire service to crash. Twitter used to be a target of this type of hack in its early days. Snapchat needs to fix this vulnerability, and prevent future DoS attacks if it wants to mature into a reliable service for users. (The Guardian)