I also happen the same way, and I am still confused, what sentences are considered spam ?
According to other phrase members what is considered spam ,,
So, in the future there will be no newbie post considered spam?
Following may be the reasons:
1) There is no issue with short sentences but they should be on topic. If someone has asked about investing in Bitcoins and you are praising an alt coin, it means you do not even read threads.
2) Another common reason for ban is copied content. Such members are banned without any warning.