Wall Street Journal: On Twitter not every tweet is gold, and the hunt for those tweets takes time. Now Twitter is taking some of the work out of that process with a new feature called Highlights, a twice-daily digest of the best dozen or so tweets that rushed through a user’s timeline that day. Twitter will comb through accounts and conversations that are gaining traction among the people a user follows as well as tweets, topics and events that are trending nearby and in the user’s network.