Content-filtering browser add-ons like KBlocker, Trump Trump and Trump Filter allow for the filtering of content based on predefined keywords. Add-ons like FB Purity and Social Fixer go further and allow the user to specify custom keywords and filters to block. However, all of these are browser add-ons, and as a result are limited to working only on browsers, even during mobile browsing.
The most common way for mobile browsers to use social media like Facebook and Twitter is through their respective, native apps. Are there any content-filtering tools out there, for any mobile operating system, that will filter content from within these apps?