To avoid letting down your friends, you are obligated to play when you don't want to.
"youre encouraged to join group quests that take place over a week and everyone's steps/flowers planted are totalled together towards the goal"
"Logging in everyday and playing maintains an active clan, which has its perks with events"
"There a guild system. To get points, you'll have to check in everyday and design a room with one or two other members from your team. You have to choose your room and complete it within a few days, and some guild are really competitive and won't hesitate to remove inactive players or players who don't manage to get an A for their design."
"A little bit, but it's not directly encouraged by the game the way e.g. WoW raid guilds can get."
"You can join a club, which will earn rewards for battling a daily club boss. Everyone who battles the boss, if the combined attack is successful, earns rewards."
"There are faction events. You need to score points to contribute to your faction, otherwise, you will most likely get kicked out."