What? Most of the things I torrent these days, I torrent specifically because I can download faster than any FTP/HTTP site will ever let me download.
I think tribler defines "social" as those who you have social ties to rather than those who you are geographically close to. It thus leverages "socialness" for security rather than speed.
I think the tribbler's definition is correct. In the modern era, we often don't have social ties to those geographically close to us. Duality should simply be called a "geo-aware" client - not a bad thing.
For lightweight, on my router I have a transmission package (.opkg[2]) that handles files not available on my small network.
[2]http://en.wikipedia.org/wiki/Opkg
EDIT: Running Openwrt (Backfire, 10.03) on Asus RT-N16
Unless by friends you mean the extended circle of people that live nearby..?
Of course, if your peers are on different LANs but in close physical proximity then physical media becomes much more useful.
