Instead of using my main account, this was built from a separate "follow-back" account I check on occasionally, which posts no genuine content whatsoever. All the accounts listing it are themselves follow-back bots or promotional accounts (lots of rappers and penny stock experts represented).
|The "follow back" hairball.|
I'm going to guess this is what happens when there are lots of accounts using some auto-listing utility. When compared to a network structure based on actual common interests instead of strategic Twitter-usage, the difference is striking.