Not terribly into trending content reminders (8)
I believe the answer is:
mementos
'content reminders' is the definition.
The definition and answer can be both related to thinking as well as being plural nouns.
Maybe there's an association between them I don't understand?
'not terribly into trending' is the wordplay.
'terribly' is an anagram indicator.
'into' means one lot of letters goes inside another.
'trending' becomes 'memes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'not' with letters rearranged gives 'nto'.
'nto' going within 'memes' is 'MEMENTOS'.
Can you help me to learn more?
(Other definitions for mementos that I've seen before include "Keepsakes" , "Reminders of past events" , "Tense mom with souvenirs" .)