Twitter rolls out feature that showcases day's best tweets

By Yasmeen Abutaleb SAN FRANCISCO (Reuters) - Twitter Inc rolled out its much-anticipated "Project Lightning" on Tuesday, a feature that shows users the site's best tweets and content as curated by a Twitter team. The feature, introduced a day after Twitter announced interim Chief Executive Officer Jack Dorsey would stay on permanently, is one of a slate of projects under Dorsey that aims to ramp up Twitter's waning user engagement and growth. When users open the Twitter app on their mobile phon