Twitter offers new option to always use an encrypted connection to access its microblogging service. The measure is designed to defend those who access Twitter via unsecured public Wi-Fi networks, which can make it easy for hackers to steal their passwords. Twitter already offered a HTTPS service, but it was not offered as a simple option in user account settings. Last year, Google launched an encrypted version of its primary search engine, and in January Facebook began implementing a HTTPS option in its user account setting.
Source: https://thehackernews.com/2011/03/twitter-offers-encryption-to-beat.html