Look at my profile by the side of the post. The left hand side. You see that thumb icon. You click on that you are giving the poster a rec. It means you like their post. Now you have no way of knowing what posts have been given a rec. More just to make the poster feel good and know that people like their posts. Think I have 152 in total. I wouldn't have any idea what posts any of those recs were for. But somebody must have liked at least 152 of my posts and clicked that thumb icon.