Brenna has turned the new Reactions feature on. 
Now we are no longer limited to just 
, we can also use 
and 
too!
To bring up the Reactions panel, long-press (or hover your mouse over) an empty heart icon on one of someone’s posts, and select a suitable reaction from the pop-out menu.
And to see who has reacted to a post and how, you can tap on the post’s reaction icons to bring up a pop-up tally:
You can keep track of the Reactions you’ve given and received from your Activity/Reactions and Notifications/Reactions pages, respectively.
The still acts as ‘Like’ in the forum sense, and is the only one that gets counted for Badges, user lists, etc.
I don’t believe the rest are limited per day in the same way Likes are, so I think you can React to as many posts as you want to. (if anyone hits any limits, come and let us know and I’ll update this info).