There will be different tools to clean your contact list based on different criteria. My idea is to show a range selector and let the user play with the amount of time you want to filter. But the focus of the app is provide a solution to visualize your contacts, as a contact list app ( as the phone one ), navigate them, filter them by different criteria, and provide a complete tool for users to really be in control of their contact list nostr.fmt.wiz.biz 

 I think I'm getting it / have experienced headaches in the past on Twitter because of these issues. Would need to hear more, but I'd be down to help contribute design if you're ok with having me =3