Do pigs like to be with other pigs?

yes they do why wouldn't they??

Pigs are 'Pack' animals. They do enjoy their 'own kind' as company. They also have a 'pecking' order, and will fight for that hierarchy position. Some are very passive, and will not care where their position is. Some will fight viciously, especially when a 'NEW' piggy comes in their 'lot', to hold their position.