It could mean that you have found a bucks rub line, which mark his travel route. However, if you are finding these rubs in and around feeding areas, they could be useless. It depends on the situation. A buck does not just meander throughout the woods without any rhyme or reason. His travel routes will often times be marked my rubs. I've found rublines that you follow at a brisk jog, but most of the times they are hard to decipher and require alot of post season scouting.