I think my computer is being spied on, how can I tell?

For some time I have felt that my PC is being spied on and maybe my mobile phone too. Can you tell me, is this possible that my computer is watched remotely? Can people gain access by using email address or facebook? How can I tell if someone is gaining access to my personal data? I really appreciate some help.

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Clarification Request
Tell me about your phone.

If it's a standard flip phone, even that Stingray can only reveal so much.

As to your PC, well, in the USA it's well known that almost everything is collected. So what to do other than use it as if you are being spied on when on the internet.

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Post was last edited on October 6, 2015 9:13 AM PDT

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