1. The crushlist, has a button in the post for a member to put them on that member's crushlist and that member on their crushlist. A pop-up box pops up asking the person who made the action if they want to be a Secret Admirer or not. In the member profile, you can also select if you wan't to disable your crushlist or keep it active. If you get a new crush member for your crushlist, you can also reject him/her. There is also a special thing called crush karma that can be enabled/disabled. It works just like normal karma, except that it only works with members of your crushlist.
2. Buddy/Enemylist. Works just like the buddy/enemylist on vBulletins.