Conversation so far:
What was Girl power in relation to the Spice Girls?
The phrase girl power put a name to a social phenomenon, and was a label for the particular facet of post classical neo-feminist empowerment embraced by the Spice Girls.
What were the reactions  the phrase 'Girl Power' was met with?
The slogan Girl Power was met with mixed reactions
Did anyone dislike the 'Girl Power' message?
Some critics dismissed Girl Power as no more than a shallow marketing tactic
What was the appearance issue criticism of 'Girl Power' message?
Critics took issue with the emphasis on physical appearance, concerned about the potential impact on self-conscious and/or impressionable youngsters
Around what year was 'girl power' message of influence?
It was not until the emergence of the Spice Girls in 1996 with Wannabe, that the concept of girl power exploded onto the common consciousness.
What else did you find interesting in this section on Spice Girls' Girl Power besides reactions, influence and criticism?
The phrase Girl Power was regularly uttered by members of the Spice Girls and was often delivered with a peace sign. The slogan also featured on official Spice Girls merchandise.

Question: What types of things made them so unique?
Self-contained rewrite: What types of things made the Spice Girls so unique in regards to 'Girl Power'?