What my book says extraversion is:
"sociable and out-going, but...encompasses much more than that...such as "active," outspoken," "dominant," forceful," adventurous," and even "spunky"...
"Extraversion
Positive Correlates
Talkative
Assertive
Energetic
Outgoing
Dominant
Enthusiastic"
"Some regard extravers as impulsive, risk taking, and unreliable, others view them as cheerful, upbeat, and optimistic. Still other psychologists describe extraverts as ambitious, hardworking, and achievement oriented. Extravers are prone to make moral judgments that hold people responsible for the effects of their actions, even if the effects were unintentional. Both male and female extraverts achieve higher status. Extravers are consistently rated as more popular and more physically attractive than introverts....argue that the best way to conceive of extraversion is in terms of the positive emotions that extravers tend to experience...extraverts are more likely than introverts to be happy, long-lived, healthy, and grateful. They have more success in dating and relationships, and are viewed as more attractive. They are more satisfied with their jobs, more involved in their communities, and more likely to attain positions of leadership."
"extraversion, conscientiousness, and agreeableness tend to be highest in the Midwest and Southeast..." (there is also a figure showing exstraversion as high in Sweden, Norway, Belgium, Spain, Switzerland, and Turkey)
"Extraverts feel good, they are peppy. That's why they act the way they do."