there are many reasons for fake Accounts. Not all is trolling.

Its a hole Industry. Online Marketings is a Multi Billion Industry.

• Sell Likes / dislikes , Followers, Shares ......

• Share News / Ads / Fakenews .....

• Fake Comments

• .......

And there rare way more reasons. Someone doesnt want to talk with real name about politics ( think about countrys there can die because of it.....)

......

And its not very difficult to create tons of fake accounts with bots....