What Twitter got right:
‘Star’ is used for a variety of reasons, most with nothing to do than to mark a tweet as favourite.
What they missed:
‘Star’ is also used as read notifier, a bookmark, and a reply-later reminder.
‘Heart’ just doesn’t cut it for these uses.
‘Like’ doesn’t work either.
‘Star’, by accident, was almost perfect.
Update: Using bright, colourful hearts, may be a good start to bringing back some positivity to Twitter.