Root of HD in library how can i delete ALL Faceb plug-ins,etc

How can i delete under my internal HD>system>library> accounts>authentication >facebookAuthentication plugin bundles & accounts>access>facebookAccess pluginbundles? why are they originally allowed there? and so is tencentweibo..and linkedin.
I dont want those plugins on my computer.
does this mean these companies have some access to my computer? or everyone's shall i say? what will happen besides me not being able to login into FB if i delete plugins and access?
Thank you!

It depends a bit on how they got added and if each duplicate represents a separate file (physical dupes) or if you have multiple entries to the same files (logical dupes). See this article How to find and remove duplicate items in your iTunes library. The method given there works fine if the duplicates were all added at the same time and are physical duplicates. If they are logical duplicates then don't delete the underlying files or you lose your only copy of the track. If the dupes are not so easy to isolate by sorting then arrange them in the usual album order and delete all but one of each repeating group.
If that all sounds like too much effort try Dupin/Dupin Lite from http://dougscripts.com/itunes/.
tt2

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