They’ll carefully select social media users getting variable for time (8)

I believe the answer is:

tweezers

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'they'll carefully select' is the definition.
(tweezers are used to carefully select things)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tweezers that I've seen before include "Small pincers" , "Hair-plucking tool" , "Device for plucking hairs" , "Instrument for plucking" , "Implement for gripping small objects" .)

I've seen this clue in The Guardian.

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