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Some companies track their workers' computer activities.

Computer activities are very abstract and therefore vague in the above for me. What are those computer activities referring to to you? Thanks.
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This probably refers to reports that companies are tracking their employees' use of the internet for their own purposes, not for business reasons - personal e-mails, chatrooms, game-playing and general surfing are all mentioned.
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Thanks, Feebs.

Got it.