Teenagers around the world use technology to keep in touch. But what are the rules? And who in the family decides what is okay? Ericsson ConsumerLab conducted an online study of 2000 US teenagers, aged 13-17, to find out. The study found that even if children have more say in how to use technology, parents are still much involved in how and when their young teenagers are using computers, mobile phones and Facebook. Facebook and "how to use the computer" are the two things parents seem to have strict rules about, especially for those aged 13-14. Around 30 percent of parents typically make the decisions for their children at this age.