Errors reported by users

I’ve had these errors reported by users, I don’t get them myself, are they to do with the site, or are they cause by users computers ?

GET http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
aaron81uk:49 GET http://www.google-analytics.com/analytics.js (anonymous function) @ aaron81uk:49(anonymous function) @ aaron81uk:50
aaron81uk:704 GET http://connect.facebook.net/en_US/all.js (anonymous function) @ aaron81uk:704(anonymous function) @ aaron81uk:705
aaron81uk:1 GET http://pixel.quantserve.com/pixel;r=1149316293;a=p-84eFbbejjm53s;fpan=0;fpa…48603;tzo=0;ref=;url=http%3A%2F%2Fwww.soundboard.com%2Fsb%2Faaron81uk;ogl= 403 (Forbidden)
buttons.js:1 GET http://seg.sharethis.com/getSegment.php?purl=http%3A%2F%2Fwww.soundboard.com%2Fsb%2Faaron81uk&jsref=&rnd=1446462848656 403 (Forbidden)stLight.createSegmentFrame @ buttons.js:1stLight.log @ buttons.js:1(anonymous function) @ buttons.js:1(anonymous function) @ buttons.js:1
aaron81uk:1 GET http://l.sharethis.com/pview?event=pview&version=buttons.js&lang=en&fpc=6ed…d%20-%20Soundboard.com%20-%20Free%20Sounds%20%26%20More&ts1446462848655.0= 403 (Forbidden)
buttons.js:1 GET http://edge.sharethis.com/share5x/index.3c401b929c426b4aced880852aeb0d98.html 403 (Forbidden)