I built an Android app a few years ago in a similar vein. It would look at texts and call logs (email was next) and use it to prioritize social relationships from your contacts. Then it would let you set goals for contact frequency, make notes, etc.

But Google locked down their APIs except for a chosen few pre-approved apps and I never launched. (It was bullshit---shouldn't have bet on the Play store, as I didn't have the political sway to be protected.)

Glad to see this being worked on!