If you make posts/replies with the sole aim of increasing your post count. That would count as spam.
You should expound this more to:
- Repeating answers (including paraphrasing it) that already have been said in past posts without adding more value can also be labeled as spam
Sometimes newbies also wonder why their lengthy posts that is on-topic is also deleted by the mods, well they don't put it into consideration that even posting repeated answers makes their post irrelevant to the topic and cannot be considered as helpful for the thread which makes them a target for members reporting it to the mods. Not only reading the OP isn't enough anymore you must also consider what others have been contributing to the thread and must know what you will add new to it next.