Twitter might just make it a little easier to silence unwanted attention from strangers -- or to forge a new friendship. It's testing profile previews in its iOS app that show more about a user without taking you away from your timeline. If you're included in the test, tapping on a user's @ handle in a tweet will show a card with their basic details and give you an option to follow or mute them. You can either return to your usual browsing or view their full profile if you need more details.