SMF forum software doesn't have support for like buttons, especially the older version that's used on this forum (not sure about the newer SMF version, I believe those have reactions).

But that's why a like button would be helpful. It's common courtesy to thank someone for help and a like button would at least curb people just littering threads with pleasantries. Sometimes a thanks is all some people require but it's a bit of a stretch for people to go suggesting people merit a post because they don't have any. A simple like button would do the job there.