The newest You Tube internet sensation is the "Flash Mob."
According to Wikipedia, a Flash Mob is "a large group of people who assemble suddenly in a public place, perform an unusual and pointless act for a brief time, then disperse."
Youtube videos showing Flash mobs performing songs in train stations, stores, and mall food courts (as shown in the video below) have been all the rage.
The social media revolution and the instant communication it offers (connect with Amplivox), organizing a big gathering is only a tweet away for those with several thousand localized followers on Twitter. In the midst of all of the surprise and fun, flash mobs can pose a very dangerous threat in the modern world. With the threat of terrorism and dangers of large crowds (stampeding, mob-mentality, rioting, pick pocketing), the flash mob can be a scary thing if the wrong people become involved.
Large-area portable sound systems such as megaphones are an essential tool to perform effective crowd control and are a staple in the hands of police and firefighters in case a flash mob would escalate into something dangerous.
Interestingly enough, portable sound systems could be used on either side of this phenomenon, either to help organize a crowd or play music to dance to, or to help control a crowd if they became out of hand. This following flash-mob video (that has over 27 MILLION views as of early 2011) uses a portable PA system to play the background music.
Below are several products that would work well for those who want to buy a flash mob pa sound system: