If raised properly from an early age, guinea pigs can be one of the best pets a person can have. The furry little animals are typically very timid towards humans they don't know well, so it is important that a lot of time is spent bonding with them. Once they become more familiar and accustomed to someone, guinea pigs love to be handled. They can even be taught to respond to certain cues.
Domesticated guinea pigs tend to be social and enjoy the company of other guinea pigs. As with any animal, if you plan on keeping more than one, it is important to see how they react to each other before taking on the commitment. If they respond well, like the ones in this video, they can become lifelong friends.