#8 & #5 I like the style and versatility of the two designs. I like #8 because it feels vibrant and #5 because it's so simple. I would prefer the graphic to communicate the Q&A aspect of our service. Especially if you can tap into a concept that represents asking questions to a collective knowledge.
#55 I like the people concept in general. I am a little worried about the size of the logo in terms of the amount of horizontal space it's using. We would ideally prefer a logo that is more compact and square or circle if possible :)