> an application that will delete all your old posts from social media every so often, to help your privacy.
I’m not sure this will help with privacy. If you keep posting, you keep giving Facebook data and helping them build their profile of you. There’s no guarantee deleting old data from your timeline will delete the data Facebook has on you. To help your privacy, you need to stop giving them data (i.e. stop posting).
That's true, but privacy is more than against Twitter/FB. You can also have privacy against a new boss, a new friend, etc. You aren't the person you were ten years ago, there's no reason your opinions should remain somewhere, immutable.
Unfortunately, this is looking very hard to do as a service, as most platforms don't let you delete posts at all (e.g. Facebook) or only give you access to a very limited amount of your own data (e.g. Twitter, where there's no way to access more than your 3200 latest Tweets).
Especially with Twitter, corporations literally have more access to your data than you, as accessing old Tweets is only done via an Enterprise API, and not via the standard API or even the website. You cannot access your own old Tweets unless you pay good money for the Enterprise API.
> an application that will delete all your old posts from social media every so often, to help your privacy.
I’m not sure this will help with privacy. If you keep posting, you keep giving Facebook data and helping them build their profile of you. There’s no guarantee deleting old data from your timeline will delete the data Facebook has on you. To help your privacy, you need to stop giving them data (i.e. stop posting).