When liking a post, many people just click on the Like Button and give the post a thumbs up by default. In case you didn't know, when you hover over the Like Button, there are other Reaction icons that can be selected besides Like's Thumbs Up. The other Reactions are titled Love, Ha Ha, Wow, Sad, and Angry. Today a new Reaction icon has been added to the list, it is is a checkmark and is titled Helpful. So if you find a post helpful to you, please select the Helpful Checkmark to let the OP know that their post was beneficial.