1) Radio Waves: The waves in the electromagnetic spectrum that have lowest frequencies and longest wavelengths are called radio waves. They are produced when charged particles move back and forth in instruments such as a antennas. When radio waves are transmitted, one of the characteristics of the wave can be varied: the amplitude or frequency of the wave. This variation is called modulation. The setting on your radio indicates the type of modulation used to carry the information to your radio: AM means amplitude modulation and FM means frequency modulation.
Facebook also lets you to make groups, have applications and have as many friends as you want - this assists you with getting in touch with people who like what you like, play games online, and make additional friends. One thing it lacks in is security from pedophiles. There is no 'report button' to report users, even if they are irritating you. It also has a social bookmarking websites, allowing you to keep your favorite websites in one place, as well as all your friends. Another wonderful idea only integrated by Facebook is the friend finder. It permits you to find friends in an instant, allowing you to connect to friends.