Responses
I think this isn't it but the ranking/poll app sounds similar to the mission/goal of Real Account.
http://www.mangago.me/read-manga/real_account/
http://www.mangago.me/read-manga/real_account_ii/
I have read real account before although the art style and plot is close this isnt the correct manga. THANK YOU FOR TRYING!!!ヾ(☆▽☆)
Manga that had something to do with a ranking or poll app where if you fell to the bottom in terms of reputation you get killed (one guy was killed by unicorn plushie) also the MC had a thing about lying bc he lied and said his mom abuses him and his dad killed her.....well he doesnt have a thing about lying anymore though bc his best friend betrayed him and now tries to bully him....I appreciate any attempts to find this manga (๑•ㅂ•)و✧ DO YOUR BEST!!!