Really easy way to do this is to grind to level 2 (literally about 10 - 20 mischief actions) then sit at a computer and use the options;
Socialize - troll teh forums
this grinds it for you with minimal effort, i needed it for the Villain part of the secret agent career and it worked really fast. (I did have Savant unlocked for my sim mind you, so yours may take a little longer)