April 14 (Reuters) - Digital media conglomerate Starboard said on Friday it has bought Parler for an undisclosed sum and will temporarily shut down the social media app popular with U. Parler is one of several social media platforms, from among Gettr, Gab and Truth Social, that have positioned themselves as free-speech alternatives to Twitter Inc prior to its $44 billion acquisition by billionaire and Tesla CEO Elon Musk. See here for a complete list of exchanges and delays