Fix the @ Tag
I use this a lot to notify the appropriate individual
1/ It works best, I believe in desktop mode, when the @ immediately triggers a scroll down menu and you can confirm the recipient.
2/ It works the least, when the scroll down menu is not created and you hope that at posting a link will be created
3/ Many times (especially in iOS) when the @ is auto-created when you hit the reply button, typing removes the tag and you need to retype the @ with limited success as per #2