Twitter adds permanent HTTPS option for improved security
There's really no reason not to enable permanent HTTPS, so click the drop down by your avatar, choose settings, and then head all the way to the bottom of the page. Pop in a checkmark, enter your password, and save. Now each time you visit the site, your activity will be wrapped in 256-bit AES encryption.
Twitter's mobile website does not currently support the permanent setting, but the company says it's being worked on.