they're not ghosting (or it is not equal to CL ghosting), but sometimes they don't ban your account for spamming, they penalize you with removing all the tweets of that account from twitter search
they're being tweeted, twitter is just removing that tweets from its searchis there anyway we can find this out for ourselves? i mean i use some throw away accounts for spamming, so it would be nice to know if my links aren't being tweeted