Wall Street JournalDaniel Graf Demoted As Twitter's Head Of Product, Rising Superstar Kevin Weil ...International Business TimesAfter being hired away from Google just six months ago, Daniel Graf has been demoted from his position as head of product at Twitter. Replacing him will be Kevin Weil, who joined in 2009 as a data scientist and turned into something of a rising superstar ...Twitter product chief sidelined as user engagement slidesZee Newsall 26 news articles »