Hey Drifter, I would suggest maybe furthering your research on this subject matter. LW may be the most downloaded p2p Program, but NOT the most widely used. There are several different ways to look at the opposing question. See Links Below.

6 Most Widely Used Free P2P File Sharing Applications | BizzNtech

LimeWire Most Installed P2P Application, BitTorrent Clients Runner up | TorrentFreak

IMO LW is Washed Up. Time to Move On. BT is the Only Way to Go for Now.
I Agree, It does seem like the MAFIAA is hitting hard right now, but I'm Thinking there may be 100's of Millions of people Downloading and Sharing Files. I figure they have a Very Tall Task ahead of them if they expect to even remotely Slow Down what we all Do and Love.
In 2004, the estimated Figure was 70 Million people. Even back then, this was Huge. They will NEVER Stop what we do. They will continue to threaten and attempt to intimidate, but They will NEVER Win.
SIN (strength in numbers)

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