datitisev The likes are for when you like a post, not for when you want to remember that post, let's say, a year from now. I am active on a forum using discourse and actively have more than 20 "favorites" ("bookmarks") saved in the forum. The good part is that as long as the forum is up, I can access them. The bad part is that I cannot use them offline (say, to give the link to somebody, while I don't have internet access).
Edit: What if you like 20 different comments from the same discussion thread, because you like them or agree with them, but want to have the most important ones saved for later? Let's say you liked my suggestion and 200 others, With time, some of the features get implemented. Do you unlike them? What about the ones not implemented? Will you keep liking the ones you want or agree with? Or the ones planed to be developed? And what about the ones you don't like but are planed for the development? Are you gonna "like" them without liking them?
Or what about 15 bugs, all of which need to be fixed, but 3 of them are critical. Are you gonna only like the 3 most important... and after fixing them, unlike them and like the other critical bugs?
