They can indicate that an IP is currently being used by a bad actor.

FORBES: DDoS Defense: Preventing business disruption

The flash crash in May has prompted a manhunt for a bad actor or actors at work.

FORBES: Welcome to the Stock Bazaar

One of the aspects of it is actually proving that information has not been changed by a bad actor.

NPR: Will 'Cloud Computing' Work In White House?

Did Goldman Sachs aspire to the culture we see in these e-mails, or was this the work of a single bad actor?

FORBES: Goldman Sachs And Legality Vs. Morality

In point of fact, it seems there is scarcely a serious bad actor on the planet with whom Jimmy Carter has not met.

CENTERFORSECURITYPOLICY: Tyranny's enabler

"A movie actor hates bad reviews, " says Medalla.

CNN: Reinventing Estrada

The Showtime thriller's British star Damian Lewis lost out to Bryan Cranston, who was named best actor in a drama series for AMC's crime drama Breaking Bad.

BBC: Sherlock's Cumberbatch picks up US TV prize

As for the Hollywood years, Morris tells us that Reagan was not a great actor--too stiff--but he was not as bad as Warren Beatty and Jane Fonda have made out.

FORBES: REAGAN'S CENTURY

Kyra Sedgwick won best lead actress in a drama for The Closer, while Bryan Cranston won best actor for his portrayal as a drug-dealing teacher in Breaking Bad - his third win in a row.

BBC: Mad Men wins top Emmy for third year running

Aside from Lincoln and Rhys, he will also face competition for the best actor in a drama series award from Kevin Spacey for House of Cards, Breaking Bad's Bryan Cranston and Timothy Olyphant for Justified.

BBC: Damian Lewis and Sienna Miller on TV awards shortlist