Two seperate hacking attacks surfaced on Wednasday, targetting mobile photo-sharing service Snapchat and Skype's social media accounts. Computer hackers posted online usernames and partial phone numbers of 4.6 million users of mobile photo-sharing service Snapchat. What's more, users' information was made available for download by a website called SnapchatDB.info, which has been suspended.

SnapchatDB said that it has patched the exploit that was exposing user's data.

With Snapchat, users can send photos and videos that disappear shortly after they are viewed.

Seperately, the Syrian Electronic Army hacker collective that supports Syrian President Bashar al-Assad hacked into the social media accounts of Skype.

The group posted the contact information of Steve Ballmer, Microsoft's retiring chief executive, on its Twitter account along with the message, "You can thank Microsoft for monitoring your accounts/emails using this details. #SEA"

That message was a reference to revelations last year by former National Security Agency contractor Edward Snowden that Microsoft's Skype was part of the NSA's program to monitor communications through some of the biggest U.S. Internet companies.

A message posted on Skype's (hacked) official Twitter feed on Wednesday read: "Don't use Microsoft emails (hotmail, outlook), They are monitoring your accounts and selling the data to the governments. More details soon. #SEA"