New here aswell and i'd assume it has some bot that checks for spam text. like key mashing. Related info on the thread. and thread reputation. for example if you've been thumbed up on this thread hypothetically the bot would notice this thread is good and your post is of some relevance and gives you a credit. else if you spam asdf 20 times your post would be null and you would get nothing.
I'm in the same boat, I was hoping it was listed clearly in the faq(since you need 10 credits to unlock some links) but it looks like it's not, I found this thread trying to search for that answer
i am new as well and i have not understand fully how to earn credits. it is a bit sad, that it is not listed clearly in the faq. but this thread helped me to understand it a bit more. thank you