San Francisco-based Craigslist.com is being used on Long Island to promote prostitution, police say. Nassau police have been monitoring the site and made five arrests this week. Newsday.com has the details. Craig Newmark (pictured) didn’t respond to Newsday for comment, the paper said. Newsday notes that “Craigslist has long been criticized for allowing unmonitored, and in some cases illegal ads, to be posted. Arrests stemming from sex ads posted there are occurring across the country.” Kurt Opsahl, a staff attorney for the San Francisco-based Electronic Frontier Foundation, is quoted as saying that Craigslist isn’t liable for what appears on its site under federal law.