split between B and D for me, one has a really nice overall shape(B) the second has the shapes really nice(good scale and balanced image)

A - just looks really simple and doesn't mean anything specific, well bitshares chat or talk I suppose.. but too simple and doesn't stand out, I find no basis to compare, all 4 with the exception of B are made in the same style.

C - looks like something I would make :D :) as far as I have learned the lines might get really flimsy if you use that in a website. To me it looks interesting, but also too simple and too cluttered as well. B does a better job of conveying the same message

E - I'd say it's pretty much like A but with proportions and shapes that are arranged in a "worst" way (the dots are small, the chat blob doesn't fit into the whole model as well as A and D)

In conclusion, B looks the best to me, simple and to the point :P

Good luck @manuelcruz and good luck to the participants, I would argue with 80% of the people here :D

Well good luck anyways :)