Hi Kamil,
the mighty beaver is back. we like the concept in your entries #9 and #8 and how it symbolizes "connection". I know you participated in an older contest for HSpot and ranked third. Your quality was above par then and it is now. Their was a lot of debate last time (in HSpot) about your logo submission, but the client ended up going another direction. So I I am happy to see your participation.
This concept is a bit medical, we were hoping to keep it professional because our clients are health care professionals but we wanted a logo that was more socially trendy and current. This will be a social network. We look forward to see what you come up with.