We all Troll ...

Trolling is simply the act of "taking the mickey" and can range from funny to outright abuse.
Spend enough time on the social media and forums and you will inevitbly troll , cool trolls are fun and always get large followings , they poke fun at the lame , the mundane , the boorish , the fascist , the misguided , the poorly informed and the outright stoopid ... ( plenty for trolls to get on with)

Shilling on the other hand...

Shilling is the act of dishonest debate , lying , misrepresenting , ad hominem (playing the man not the ball) , strawman arguments ( offpoint , absurd or nonsense invective presented as argument) and the Hegelian Dialectic (aka problem reaction solution) ,Shills are often paid by govenments and neferious organisations to misrepresent themselves ( often their identities are fabrications) and counter any dissenting or alternative opinions or infromation presented as fact or opinion . Shills compromise a large percentage of commenters and replies and even posts . entire sites and organisations can be shills (like the BBC CNN FOX DW and much more).

Shills engage in whats called "counter intelligence propaganda" or cointelpro for short. Many "so called " truthers , like David Icke and Infowars are in fact connected to the "deep state"
and exist to control the alternative media narrative .