PR Week: Vivian Schiller, former global chair of news at Twitter, has joined Weber Shandwick as executive editor-in-residence, effective immediately. In the newly created role, Schiller is based in Weber’s Mediaco content consulting and publishing unit, and reports to the firm’s newly minted chief digital officer Chris Perry. The position is part-time, although Schiller explains that she will put a “substantial amount of time” into the role.