Sources of emotions and moods: social activities

Do you tend to be happiest when out with friends?
-For most people, social activities increase positive mood and have little effect on negative mood.
But do people in positive moods seek out social interactions, or do social interactions cause people to be in good moods?
-It seems both are true.
Does the type of social activity matter?
-Indeed it does.
Research suggests activities that are physical (skiing or hiking with friends), informal (going to a party) or epicurean (eating with others) are more strongly associated with increases in positive mood than events that are formal (attending a meeting) or sedentary (watching TV with friends).