“Every day, a growing number of people log in to Twitter. Usually these login attempts come from the genuine account owners, but we occasionally hear from people whose accounts have been compromised by email phishing schemes or a breach of password data elsewhere on the web,” says Twitter in a blog post.

How to enable the two-factor authentication

When you sign in to Twitter.com, the website will ask you a second check to ensure it's really you. The site will ask to enter the verified phone number and a confirmed email address.

To get started, you need to visit account settings page. Choose the “require a verification code when I sign in”. Then click on the link to “add a phone” and go ahead the with prompts. After having enrolled in login verification, you'll be asked to enter enter a six-digit code that Twitter sent to your device via SMS each time you sign in to twitter.com.