It's best to wait until you have completed the main storyline before taking on the girls from the internet, since the more girlfriends you have, the more attention they require and the more often they will call.Dating multiple girls at once is a risk if one of those girls is Kiki Jenkins, because she starts to stalk you, and eventually dumps you if she catches you with another woman.
You're going to have to go to an internet café and browse the in-game websites Love Meet and Craplist (which are always on your homepage when you logon).
Don't take your friend to an activity that he doesn't like or your 'like stat' will reduce.
You can perform upto four activities on each outing in order to give your 'like stat' the highest possible boost.
Each friend offers a 'special ability' in return for maintaining a good friendship.
In order to unlock a friend's special ability, you must have a high 'like stat' for that friend, and this stat is based on how regularly you hang out with your friend.