A developer that’s trying to highlight the dangers of forgetting about personal privacy has unveiled a new service that shows how easy it is for users to have their phone numbers acquired by Facebook visitors, the Los Angeles Times reports. The service, called Evil, sifts through Facebook groups to find posts left by users that include their phone numbers. It then displays the person’s name and all but the last three digits of their phone numbers on the site. The issue, according to Tom Scott, the tool’s creator, is that there are a slew of Facebook groups that are created each day by folks who lose their phones and need their friends’ numbers back. Rather than e-mail each person individually, those people create groups where users can simply post their numbers to the group’s wall. From there, the group owner can take the numbers and put them into their new phone.