The internet is yet to be faced with a threat that is as big as the Heartbleed which was in reality a major security flaw and it is high time that you save your online accounts from this.
Many of the websites were affected by this and it advisable for everybody to check their security settings as well as change their passwords.
Among the social networking sites, it has been advised to change your passwords for Blooger, Facebook, Instagram as well as Tumblr and YouTube but since Twitter and LinkedIn were not affected by the bug, you do not need to fret about your accounts with them.