Can we trust skype ?

Recently, I have read about surveillance via social networks and how unauthorized persons and organizations, spying on the people. They have used proprietary softwares for such activity. Skype is the most popular Voice-over-IP program, and it is really helpful to make virtual conversations. It is used by not only people, but the governments as well. It's been more than 10 years since they announced the first release of skype and now, almost all the people are addicted to use skype for internet calls, even they provide less service than they used to be.
Skype comes with freemium license, which is basically free but advanced features are available for money. However, it is true, that we cannot guarantee our privacy if we use proprietary program like Skype. We can't be sure who is listening in. Why ? because the code isn't open and we don't know what exactly happening inside, where it connects and what encryption it provides.
As an open source enthusiast, I explored  about alternatives for skype which can be trusted. And I was lucky to find a super tool for VoIP, which is absolutely open source and distributed under LGPL license. It is jitsi. It is available for all the platforms and in case you may use the source to build it into your platform.

Finally, I need to mention that, jitsi isn't popular like skype. Therefore, you cannot completely stop using skype. So, I hope to see more users on jitsi (including my friends and clients) near future.