Skype's biggest problem isn't about being popular, it's being popular with the wrong crowd. According to specialists, the VoIP software is used on a large scale by terrorists organizing their next hits.

Security agencies try to figure out terrorists' communications and it seems that one of the most successful tools is Skype because it gives the users anonymity. Bear in mind Skype is the most popular VoIP tool around the world with over 100 million users.

Although experts have the knowledge to intercept conversations supported by VoIP, many areas around the globe which are considered dangerous and with high terrorism activity don't have the technology necessary to intervene. Even the United States have a hard time tracking VoIP in real time even though they have the latest available technology. VoIP works very similar to the way email does, the information is broken into bits and transferred through the least busy route over the Internet.

Corporations aren't too pleased with Skype either, considering approximately 17 million registered Skype users are using the service for business purposes. The fact that Skype can be used by hackers to penetrate the network is the main reason for business owners to put Skype on the black list of software, right next to peer-to-peer and instant messaging.