[beardyw]

I can imagine something like "you haven't contacted xxx for a while, maybe you should see how they are doing." Or "why don't you invite xxx to yyy."

[eye_dle]

Would be good. It somehow should take into account relations the person has with other people. LinkedIn tries to do something similar but they have no idea of my relations, hence sending notifications like "Wish HB to the <person I've never talked before>"