For now, against dropping internet fad (4)
I believe the answer is:
meme
'internet fad' is the definition.
I can't judge whether this definition defines the answer.
'for now against dropping' is the wordplay.
'for now' becomes 'mean time' (I've seen this before).
'against' becomes 'anti' (prefix meaning against).
'dropping' suggests deleting specific letters (some letters drop out).
'meantime' with 'anti' taken away is 'MEME'.
Can you help me to learn more?
(Other definitions for meme that I've seen before include "Cultural belief that assumes a life of its own" , "Concept that spreads rapidly on the Internet" , "Image etc. that spreads rapidly on the Internet" , "Often trite image" , "Cultural feature passed on by imitation" .)