that'll
That'll be Anonymous then.
Much as when the pool was closed due to aids
Police are investigating a security breach at a London university medical school that resulted in users getting a stream of obscene and defamatory emails. Unidentified hackers sent a series of libellous, obscene and abusive emails, one of which falsely claiming that executive members of the St George's University of London …
Doesn't sound like /b/ or Anonymous, both of whom are very open about what they do.
Anonymous have more serious targets and attack with good reason.
/b/ get their lulz publicly, having nothing to hide but their esoteric digital art collections.
Those so quick to condemn /b/ should really get a 4chan Gold Account and explore the site in depth before making unfounded accusations and besmirching the good name of innocent /b/ros.