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tips for safe social networking:• Learn about and use the privacy and security settings on social networks. Consider restricting access to your page to a select group of people—for example, your friends from school, your club, your team, your community groups, or your family.• Think twice before posting pictures you wouldn’t want your parents or future employers to see.• Be cautious about how much personal information you provide on social networking sites. The more information you post, the easier it might be for a hacker, thief, or stalker to commit a crime.• Install a security suite (antivirus, antispyware, and firewall) that is set to update automatically.• Use tools to manage the information you share with friends in different groups. If you’re trying to create a public persona as a blogger or expert, create an open profile or a “fan” page that encourages broad participation and limits personal information. Use your personal profile for trusted friends.• Let a friend know if he or she posts information about you that makes you uncomfortable.• If someone is harassing or threatening you, remove the person from your friends list, block the person, and report the incident to the site administrator.• Make sure that your password is long, complex, and combines, letters, numerals, and symbols. Ideally, you should use a different password for every online account you have.• Be cautious about messages you receive on social networking sites that contain links. Even links that look they come from friends can sometimes contain malware or be part of a phishing attack.• Be aware that people you meet online might be nothing like they describe themselves, and they might not even be the gender they claim.• Flirting with strangers online could have serious consequences. Because some people lie about who they really are, you never really know who you’re dealing with.

computers cannot replace teachers. But the computer, she recognizes, can do some things a teacher cannot. It can offer personal feedback to a whole room of students as they work. And it can give the teacher additional class time to do more creative and customized teaching. “Combining Khan with that kind of teaching will produce the best kind of math,” she argued. “Teachers are more effective because they have a window into the student’s mind.”

announcing a similar initiative in April called Coursera.

but students who complete the classes don't earn university credit toward a degree. Instead they receive a certificate of completion, sometimes referred to as a badge.