Which logical fallacy is used in the text?
Teens shouldn't get cell phones. It's just a matter of time before they'll stop seeing friends in real life—they'll just text each other from their rooms.

 - straw man: a misrepresentation of an opponent's position that makes it easier to argue against
 - slippery slope fallacy: the false assumption that a small first step will lead to extreme consequences
 - false causation: the assumption that because two things happened together, one caused the other
The text argues that having cell phones will lead to teenagers no longer meeting in real life. However, this argument offers only an extreme outcome and ignores other more likely outcomes. For instance, teenagers may sometimes meet friends in real life and sometimes just text with friends. This illustrates a type of logical fallacy known as the slippery slope fallacy.