MAC ID Security and Privacy?

[Airplanet]

Please tell me can anyone see what we are watching or doing or access on our device(Computer, Mobile and laptop etc) using the MAC ID of our devices(Computer, Mobile and laptop etc)?

Inshort is the MAC ID sensitive thing if any stranger get this MAC ID of our device then what he can do?

Should i hide my devices MAC ID from everyone?

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[UsandThem]

I see this was already answered on other forums, with no further participation or additional questions from you at two of them:

https://www.bleepingcomputer.com/forums/t/758681/mac-id-security-and-privacy/
https://community.cisco.com/t5/other-security-subjects/mac-id-security-and-privacy/td-p/4469695
https://forums.tomshardware.com/threads/mac-id-security-and-privacy.3732357/