It's definitely true, it's just the cutoff number I'm not sure of. You need a certain number of posts before you can use the "like" button, and certain number postsbefore you start your own thread, but I don't recall the exact number or whether the minimum number for the two are the same number or different totals. At least one of the values was definitely either 100 or 125.
So yeah, just keep posting. I remember it seemed to take me forever, because I didn't want to post ****** content just for the sake of boosting my post count. I prefer to post ****** content that is important to me. But it was frustrating because there were a lot of posts that I wanted to be "liking", and couldn't do it.