Did you know that Twitter and LinkedIn offer two-step authentication to help you secure your accounts? Here are a few articles to provide additional information:
Protecting your LinkedIn Account with Two-Step Verification — Provides a step-by-step video on how to Turn on two-step verification for your account.
Twitter does the two-step, gets serious on security with new authentication feature — the two-step works by sending a pin code via text message to a user’s cell phone.
Getting started with Twitter’s login verification — a good step-by-step walk-through on the two-step authentication process.
Twitter Introduces Two-Step Authentication — includes a one-minute video covering the two-step authentication process.