What is a fanlisting?
A fanlisting is simply an online listing of fans of a subject, such as a TV show, actor, or musician, that is created by an individual and open for fans from around the world to join. There are no costs, and the only requirements to join are your name and country.
Fanlistings do not have to be large sites (although some are); they are just a place where you can sign up with other fans. TheFanlistings.org is the original (but not official) web directory for fanlistings, dedicated to uniting the fans.
About the sisters' powers
As magical witches, the Charmed Ones have the four basic powers of spell casting, potion making, scrying, and mediumship. Each Charmed One is particularly skilled at one of these powers. For example, Piper is the best at making potions due to her passion for cooking, and Phoebe is the best spell-writer due to her creativity and dedication to her Charmed heritage. Although Prue and Paige's basic Wiccan skills were good, their specialty was more at thinking and devising plans and helping innocents, respectively.
Because powers are linked to one's emotions, when one of the sisters becomes emotionally distressed, her powers will be affected. If all three sisters are distressed at the same time, their combined magic (The Power of Three) will be weakened. Since the Book of Shadows is also linked to the sisters' bond, when their combined magic is weakened, so is the power of their book. This makes the book vulnerable to evil.
Aside from their basic abilities, each Charmed One possesses separate active powers which are destined to grow and advance over the years. These powers are linked to each other, which is how their advancements are 'selected'. Each Charmed One possesses one of Melinda Warren's powers (more commonly referred to as "The Warren Powers") and are given by seniority; Telekinesis, Molecular Immobilization and Premonition, respectively. The youngest sister, Paige, is an exception to this rule due to being the replacement of Prue, and therefore possesses a telekinetic power.
