A friend once said that both introverts and extroverts can handle solitude and social situations for small amounts of time, but:

an introvert needs solitude to recuperate from an intense social situation.  

an extrovert needs companionship to recuperate from being alone.
 
People also seem to naturally be wanderers or home-dwellers.

Some have an itch to leave and wander freely, and some to return to home after being away.