"We want people to feel somewhat comfortable that when you place an ad listing, say, a diamond ring for sale, there's a reasonably good chance four guys won't come to your house and kill you for it," wrote Newmark. "That's our pledge to you."
The company is also cracking down on other crimes facilitated by Craigslist, such as prostitution.
"When you place a listing offering 'a good time' in quotes and include a naked picture of yourself and hourly rates, we are counting on you not to be offering prostitution services," reads another warning on the site. "Please don't let us down."
"We are dedicated to reducing to acceptable levels the number of Craigslist-related crimes, be they prostitution, robbery, fraud, extortion or pederasty," wrote Newmark in the release. "But we're concentrating primarily on reducing murders because, let's face it, that's bad for business."