Micro = small in terms of functionality, it should do 1 single thing, for instance 1 micro service just to manage your sharing feature. However, it should be in

Micro = small in terms of functionality, it should do 1 single thing, for instance 1 micro service just to manage your sharing feature. However, it should be independent and contain also its storage/db, so it won't be that micro in terms of size/code. I'd recommend to look for Netflix talks on the topic, very well done and informative.