LinkedIn’s Intro app embeds a link to an email sender’s profile on the professional network. Security experts say the app presents a number of security risks and should not be used. LinkedIn has defended Intro, saying the criticism is based on “inaccuracies and misperceptions” LinkedIn has suffered security breaches before, including last year’s 6.5 million member passwords taken from a LinkedIn server were posted on a Russian hacker forum. LinkedIn says the iOS device’s security profile is not changed, as Fox contended.”]