title: Share Direct Message (DM) from Flutter App to Messenger and Instagram
body: <p>I want to share a text as direct message (DM), from my flutter app to Messenger and Instagram direct.
  The user will click on icon within the app to open the right social media. I don't wan't to open the system window with all apps available.
  It's already working for What's app or Twitter. I click on an icon and it's open a link which open message with filled text.
  I use the <a href="https://pub.dev/packages/url_launcher" rel="nofollow noreferrer">url_launcher</a> package to do it
  example : 'https://api.whatsapp.com/send?text=$text&amp;url=$url'</p>