I am pretty sure I add comments most of the time, but occasionally just toss a like on a thread with no comment. Maybe in a hurry, or just not feeling it at that moment. IDK. I am only on two forums and no FB (just hate FB). Its SMF and a mountain biking one. I wouldn't judge a like with no comments. But comments are nice to read just the same. the mtb forum is more "wild west", which has some downsides. But the like and or comment included is about the same. its all good.