To track and analyze reactions, you need to have a Professional Max account. Brand24 monitors interactions in social media.
Firstly, you can enable them on the chart inside the dashboard - just click Show interactions in the top left corner of the chart.
The chart will now display number of likes, shares and comments:
When you scroll through Social mentions, you'll see number of interactions over each mention:
Last, but not the least, when you'll go into Analysis tab. Here's where you can see the list of the most popular mentions coming from your project: