Because of increased awareness of hackers and malware, social media sites are becoming more selective in the security and privacy safeguards they employ.  Snapchat is well aware of this, and as a result, they deploy cutting-edge security measures like firewalls and encryption to safeguard their users' accounts.  For instance, Snapchat doesn't let regular users simultaneously log in from many IP addresses.  Snapchat will send you an email as soon as this happens, making breaking into another user's account very difficult.