Posts affected vacant texts? (6)
I believe the answer is:
tweets
'posts' is the definition.
'affected vacant texts?' is the wordplay.
'affected' becomes 'twee' (I've seen this before).
'vacant' means to remove the middle letters.
'texts' with its centre removed is 'ts'.
'twee'+'ts'='TWEETS'
(Other definitions for tweets that I've seen before include "Posts made on Twitter" , "Sends social media comments, information, etc" , "Chirps social media postings" , "online comments" , "Short internet messages" .)