If its for college, credit your sources. Just kidding. But you can apply the same concept with how academia hates when people use Wikipedia as a source because it may be unreliable. You can say similar things about random people on the internet.
Madonna | Prince | Janet | Britney | Gaga | Nirvana | The Beatles | Beyoncé
An advantage is that you have a discussion or communicate with people who share your interest. Another advantage is that you can reach a large number of people and hear a wide variety of opinions on a topic, but a disadvantage is that people can be rude because they are hiding behind a keyboard and they may say things to others that they wouldn't say in person.