Speaker leaking head of state's post on social media (5)

I believe the answer is:

I'm a little stuck... Click here to teach me more about this clue!

'post on social media' is the definition.
'tweet' can be an answer for 'post'. I am unsure of the 'on social media' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for tweet that I've seen before include "Note from flier" , "Twitter" , "sound made by bird" , "Birdsong" , "Online communication" .)

I've seen this clue in The Telegraph.

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