Talking from personal experience sharing passwords doesn't help nor does it benefit anyone. It's better to trust the other person than to have them give you their password. Also if a person is untrustworthy and are for example cheating they can communicate with their other via means other than the account they've given you a password to. Also If a person has trust issues nothing will comfort them. In addition many people are just too vindictive, immature and such to handle this... relationships especially teenage ones are so fleeting I don't believe they should be doing this. It's bad enough they are sexting each other and when they break up post what they sent each other to get back at each other on the interwebs.

I'm with you on calling it the impulse drive. I'd prefer that over naming it after the creator. Crossing the tracks and referencing star wars hyperdrive is 0.5 past the speed of light. Either way it's a pretty exciting development to me.