Related Clues:

• Harangue worker after end of labour
• Repeating oneself in something that might go viral
• Fast-spreading idea
• It might start 'Don't get me started ...'
• Something trending online
• Repeatedly reposted item
• __ and rave (show anger)
• Blow up on a blog
• Image etc. that spreads rapidly on the Internet
• Talk frantically
• Many a Facebook repost
• Read note, oddly, as expression of anger
• Engage in a diatribe
• Shout irrationally when tarn disturbed
• Bellow, rave