Twitter has increased the security it offers to users of its microblogging platform by adding two-step authentication to the sign-in process.
The process requires that users add a mobile phone number to their account. With the two-step authentication enabled, Twitter will send an SMS to that number with a code that must be entered in addition to the username and password in order to gain access to the Twitter account. The code will be sent each time the person logs in via the web, but is not required for subsequent sign-ins through Twitter apps.
This new security feature is optional.
