Security
With it's popularity, Skype is a target for hackers and attackers looking for ways to steal personal information such as passwords. Though developers encrypt Skype calls, especially with newer versions, the messaging program is still susceptible to being hacked, especially if the proper security measures aren't taken by the user. Hackers are always looking for new ways to break passwords and access personal information; so, as a user, a few simple measures, such as befriending people you know and only exchanging files with people you're familiar with, decreases the chances of unauthorized intrusions that could diminish privacy and security.