Twitter has changed the way that users access the company s main site, now giving them the option to enable HTTPS by default. The change does not apply to all of the popular apps users use to access Twitter on smartphones and other devices. The move by Twitter follows a similar one by Facebook earlier this year, which gave users the option of enabling SSL by default, which also does not work for users who access Twitter.com on a mobile browser. For now, mobile users who want to be able to rely on SSL should use the official Twitter app or one of the others that allows that option.
Source: https://threatpost.com/twitter-gives-users-option-turn-https-default-031611/75033/