How to stop random spam being posted to my social media account?

Hello, I was wondering if anyone could help?Back in July my Instagram page was what I thought was hacked, and spam content was posted onto it. I deleted the post, changed my password etc. All was okay until three days ago when the same post was posted to my Facebook account. I deleted the post, changed my Facebook password, email password etc. The next day, the same post was posted onto my account again. This time I completely wiped my phone, removing all photos messages etc. Today, the same spam post was posted to my Facebook, despite my phone being completely wiped. Does anyone know how I could get rid of this problem? Thankyou in advance. 

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