Go South Coast, which runs services across the south of England, have installed the seats on 13 of their buses in Wiltshire and Dorset, including a fleet of new ADL E20D Enviro200 MMC single-decks operated by Thamesdown at Swindon.
It is hoped the scheme will also discourage people from putting their bags on free seats next to them and deterring strangers from sitting there, a common problem on busy routes.
It comes after a major think tank called for a "civility code" to stop Londoners from being rude and unfriendly to each other.
The seats have been designed to enable large families to sit together and have a more comfortable and enjoyable experience as well as trying to make the commute more sociable and friendly,
"This is an excellent opportunity for us to gain an insight into which vehicles people enjoy travelling on before making big decisions about the future of bus travel."
All twelve (fleet numbers 2772/3/4/6/7/8/9/80/1/2/3/4) are in service in Swindon on route 5 with one on loan to Morebus in Poole (2775) which is used on their m1/m2 service for evaluation of the social seating.