They can also alienate some of a site's target audience - especially teen users who expect more freedom of expression.'There are companies out there that are doing a very good job, working within the confines of what they have available,' said Brooke Donahue, a supervisory special agent with an FBI team devoted to Internet predators and child pornography.
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One of the providers is Aristotle International Inc, which offers a variety of methods, including having a parent vouch for a child and make a token payment with a credit card to establish the parent's identity.
Yet even though defensive techniques are now available and effective they can be expensive.
– Eine Sache, die sich übrigens mit dem Alter doch ein bisschen ändert: Man kann die Spielchen mit wachsender Erfahrung auch einfach sein lassen.
Officers took control of the teenager's computer and arrested the man the next day, said Special Agent Supervisor Jeffrey Duncan of the Florida Department of Law Enforcement.
The alleged predator has pleaded not guilty to multiple charges of soliciting a minor.
Duncan, one of a half-dozen law enforcement officials interviewed who praised Facebook for triggering inquiries, said: 'The manner and speed with which they contacted us gave us the ability to respond as soon as possible.'Facebook is among the many companies that are embracing a combination of new technologies and human monitoring to thwart sex predators.Such efforts generally start with automated screening for inappropriate language and exchanges of personal information, and extend to using the records of convicted pedophiles' online chats to teach the software what to seek out.Facebook's software likewise depends on relationship analysis and archives of real chats that preceded sex assaults, Chief Security Officer Joe Sullivan told Reuters in the company's most expansive comments on the subject to date.Even those companies with state-of-the-art defenses spend far more time trying to stop online bullying and attempts to sneak profanity past automatic word filters than they do fending off sex predators.Still, as the Skout case showed, there are several recent trends that have heightened the concerns of child-safety experts: the rise of smartphones, which are harder for parents to monitor; location-oriented services, which are the darling of Net companies seeking more ad revenue from local businesses; and the rapid proliferation in phone and tablet apps, which don't always make clear what data they are using and distributing.Minors don't show up in public searches, only friends of friends can send them Facebook messages, and only friends can chat with them.