Your Twitter timeline is no longer reserved for people you follow. A recent addition to Twitter's "What's A Twitter Timeline?" page explains to users that people may start to see "popular" or "relevant" links appearing in their timeline, a space originally reserved for tweets and retweets from the people you've chosen to follow.The change, first spotted by The Next Web, is expected—this month Twitter tested two new features that displayed tweets that weren't explicitly shared in your timeline.