Matt Richtel in today’s Times: “Young couples have long signaled their devotion to each other by various means — the gift of a letterman jacket, or an exchange of class rings or ID bracelets. Best friends share locker combinations.
The digital era has given rise to a more intimate custom. It has become fashionable for young people to express their affection for each other by sharing their passwords to e-mail, Facebook and other accounts. Boyfriends and girlfriends sometimes even create identical passwords, and let each other read their private e-mails and texts.
They say they know such digital entanglements are risky, because a souring relationship can lead to people using online secrets against each other. But that, they say, is part of what makes the symbolism of the shared password so powerful.” (…)
“Students say there are reasons, beyond a show of trust, to swap online keys. For instance, several college students said they regularly shared Facebook passwords — not to snoop on or monitor each other, but to force themselves to study for finals. A student would give her password to a friend to change it — and not disclose the new password — thereby temporarily locking out the Facebook account holder and taking away a big distraction to studying.”

An offer you can’t refuse: you give me your username and your password; I give you my love.
If your e-mails and your secret Facebook conversations are interesting enough I might give you eternity.
Please send your username and your password to Johannes@arnongrunberg.com. Within 24 hours you will receive a written confirmation of my unconditional love for you.
If my unconditional love doesn’t satisfy you, you can always change your password.