Mashable: Twitter is launching a bold TV experiment and if it takes, it could change the face of second-screen viewing. Twitter’s “TV Timelines” test pulls up a special interface allowing users to track not only all the conversation revolving around a specific TV show, it also displays highlights and key media, such as show-related photos, vines and videos. The obvious benefit is that users can dive deep into the Twitter conversation for a particular show and easily ignore everything else — because they’re not seeing anything else.