https://www.cnet.com/news/linkedin-reactions-lets-you-express-curiosity-love-and-other-emotions/

LinkedIn hopes the move will spur the company's more than 610 million users to engage more with posts on the site. The reactions function also gives the social network more data on how users feel about certain topics. 

Other social networks, such as Facebook, rolled out reactions years ago, but LinkedIn says its new feature caters to its professional audience.