On KidzTalk, the closest thing is favoriting a user, which you can do by clicking on their registered username and clicking the star/heart in the top corner. On KidzNet, there's an option to be friends. As KidzSearch said, KT is more of a Q & A forum, while KidzNet is more like kid facebook (the original title was actually going to be KidzBook, but they changed it to KidzNet when they made it). KidzNet is a lot more active with users, although I believe KidzTalk gets post approved faster.