Darn, why can I give Frogboy only one karma...
Amount of Karma you can give to anyone is linked to your Forum Rank. Citizen can give +1, Apprentice (veteran) +2...I am not sure of the rest, but i do know that Journeyman can give +4 and the Stardockians +8.
This all of course is pertainent to the site to which you are ranked.
For instance here on demigodthegame.com i am a citizen and as such can only give +1. On Galciv2.com i am a Veteran, or Apprentice as it is now known and can give +2 karma.
So for times when i want to give a Demigod poster +2 i need to copy the thread number over to GC2 and read the thread from there and then give the +2.
Whether or not that actually translates to +2 on Demigod i am not sure, i believe not, at least not untill the person in question whom i gave karma to actually posts on GC2, and even then i think they need to recieve karma from that originating site. That is why you see many different karma levels across all the SD sites. On GC2 i have +71...here, +16...and on SINS i think +7...JU...who knows, never looked.