VibramMen's 16m3103 V Running Shoes

I have 2 questions. Should the vibram be always used with a five fingures toe socks? Can i use this in winter?

I wear a size 41 for the Komodosport. It fits well. Do I hv to go one size down as mentioned in the website? My foot length is between 10-1/4 n 10-1/2

What happens if you stub your toe?

Can i use these on pavement, or only track?