The profile is @spamdetector, and the messages it accepts are of the format
Whenever you see a suspicious account, you can simply send us a notification and our system will check if this account is likely a spammer or not. This helps us to improve our heuristics, and we can help Twitter to shut down suspicious profiles, leading to a better service.
This work was carried out by Gianluca Stringhini, a PhD student at University of California, Santa Barbara, working as research assistant at the Computer Security lab. And you can find my tweets at @thorstenholz.