Well Js ... In fact Youtube, facebook, twitter, pinterest, tumblr and other social networks are for attraction, but I really doubt someone who is using them to see free vids will pay for it suddenly ... so see it as tool, but converting traffic ??
... and that's really not the same case in the business I run, as social medias , and principaly faacebook is a HUGE source of trafic, and this is converted by the ads in the site ...more trafic, more expensive is the ad
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Nick