I have a few small changes that if you can change I will award you the winner. So far I like 66 the best.
1. Use a smaller font for Robot so that Ears is the same width. Another small thing you could do is make the word robot a lighter black or dark gray. We want the emphasis on the word ears not robot.
2. I need a solid black and solid white version of the logo.
3. The eyes have to be either squares or circles. We had some friends take a look and they asked why does the Robot look Asian. I think it's cool but we wouldn't want someone to get offended. :)
4. Make sure the framing is very clear between the icon and the text. Your #78 does a very good job at that. #40 and 52 also do a good job as well.
5. On the previous note, once you make the changes above can you do it for both #66 and #78? We want to decide if we want to do a horizontal and a vertical one. These will be really small logos used mainly on FB photos. Take a look at this link to get an idea of where the logos are used.
https://www.facebook.com/events/687192861325420/