These Craigslist killers aren't the same type you've been reading about in the news -- Trend Hunter's reference to Craigslist Killers are online classifieds sites that are in direct competition with Craig Newmark's baby.
In addition to what we're dubbing Craigslist killers, this cluster includes online niche classifieds, sites that facilitate online swapping and bartering, as well as fun Craigslist parodies.
Implications - Websites like Craigslist and Kijiji have taken advertising where more people can be reached. Millions log on each day and it's become a lot easier to sell personal items compared to posting in newspaper classifieds. The benefits for businesses is that it brings them closer to consumers due to the ease of communication.