Upon checking those posts i find they are either deleted or from long past.
You do not need to like every post to increase your friends like count. It is more like you are abusing our system. So stop it else action will be taken. If possible check your profile and unlike every post you liked unnecessarily. Its really shameful how long time existing people end up doing such cheap activity to make activity/stay at top.
It is absolutely unethical way man. I discourage you from doing it.