I used to have an account there but I cancelled. When you submit a link or two there is a notification ''you submit too many links, come back in an hour'', it actually worked for some time but later this message stuck there and I couldn't submit anything. I came back in a day, a week, a month but always had the same stupid sentence below the capcha form. I thought it was some sort of glitch but their support teem told me that it was a sort of ban. I couldn't submit links any more and was allowed only to ''enjoy'' the junk dropped there by others. I deleted my account then. No, I didn't spam or violate their rules. It's just that rotten. I used to get 10-50 visits to my blog from it per day submitting 2-3 articles per week to relevant subredits.
What I recommend is not to submit there often to avoid a ban, it's crucial to participate in discussions and comment on posts made by others (this is what I didn't and may be that's why I failed), find popular subreddits in your niche to post to and create your own subreddit(s). Reddit doesn't work good for all niches.