Is there a ready-to-use software that allows registered users post anonymously?

Hey Everyone,

Can you help a mostly non-technical hacker out? I am looking for ready-to-use software available which will allow me to create a blog that lets registered users post anonymously. Only registered users will be allowed to post. The users will be verified through LinkedIn or social media when they signup.

I’m not a fan of Wordpress, I think it’s spammy and bulky. Is there is an alternative? Hoping to find a platform easy to setup with built-in plugins like Shopify but for blogging / posts. Thanks in advance for your help.