OP I think you should keep close attention to
[CLUB] The SpamBusters... thread because with a lot of success we are investigating all sorts of abuse, especially bumping and other forms of spam.
There are constantly new ANN threads taking under the microscope and of course, many of them are obviously breaking the rules using alt accounts or bumping services.
I think it could be a good source of information to make this list of "ANN threads that are using bumping services" even more accurate.
Yeah I know about Spambusters, I've been active there for a few months now, since I started with spambusting/scambusting activities, and it is indeed a good place to share findings and ask for advice. One of the few threads that are on my watchlist.
Update
2 Announcement threads from the list changed their status to "Inactive"
- Crybet stopped with their bumping activities 2 weeks ago, soon after being busted for plagiarized content, accounts tagged and bunch of posts deleted
- Cleobet decided to lock the thread, therefore no point being marked as active for now.