The social media platforms of the company have been hacked by a group claiming to be the Syrian Electronic Army (SEA).
The group posted a message telling people not to use#Microsoft, the owner of Skype.
It claimed "they are monitoring your accounts and selling the data to the governments".
The hack comes after recent revelations about surveillance programmes being run by US intelligence agencies.
Skype acknowledged that it had been hacked but said that "no user information was compromised".
The Syrian Electronic Army (SEA), which says it supports President Bashar al-Assad, has been behind recent hack attacks on the New York Times and Twitter.