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How much matters
If you are getting your workload done, and reading TechRepublic blogs in the time gaps makes you a more skilled employee, then I don't see where you would be shorting your employer. Most employers accept that there also is some degree of natural "personal time" - getting a brief call from home, chatting with fellow employees, walking to the coffee machine, etc. If facebook usage is within those limits, it may be harmless. The key thing is to pay attention to whether the behavior is actually excessive and is being falsely justified - each of us can make that judgment call. So do our colleagues and bosses.