Under the FAQ it reads:
"Topic Influencers are members of our community who have a high MHO%, ask engaging questions, and have high overall interaction in certain topics on the site. These members have been identified as helpful, knowledgeable, or simply post interesting content about specific topics.
When a Topic Influencer asks a question or posts a myTake in their designated topic, the post will automatically be promoted and featured on the site. Similarly, when a Topic Influencer posts an opinion to a question in their Topic, their opinion will appear at the top of the default sorting list for their gender. These members can also add their social media accounts to display on their profiles!
Topic Influencers' posts will be marked with a purple Influencer badge next to their username."
I first noticed this badge next to @Waffles731 name, go check that out because he's got a cool purple badge on his profile :P
Most Helpful Guy
I have seen it and read about a question from someone else who got the badge - GaG love their badges, don't they - I usually let this things pass me by, some people love all the badges but I find them a bit overcooked personally - I would prefer just to have a profile with my age, pic and country - I don't need any badges if people want to know more they can read "About Me" or read my opinions - As I say to each their own some people loved being a "Master" but I didn't like it so I deactivated and started again/3