They're constantly sending messages about women breaking see-saws! (8)
I believe the answer is:
tweeters
'they're constantly sending messages' is the definition.
The definition suggests an adverb but the answer is not.
'women breaking see-saws' is the wordplay.
'women' becomes 'w' (standard abbreviation).
'breaking' is an insertion indicator.
'see saws' becomes 'teeters' (I am not sure about this - if you are sure you should believe this answer much more).
'w' put within 'teeters' is 'TWEETERS'.
'about' is the link.
Can you help me to learn more?
(Other definitions for tweeters that I've seen before include "Speaker systems and Twitter users" , "Users of Twitter social network" , "Speakers" .)