You are contacted by an old friend who invites you to a gettogether. After hanging for a while, the friend wants to show you something really cool. He leads you to the secret lab where he works and uses his security pass to get you in after hours.
There he shows you a special device. It can send a message back in time to one of four days, New Years Day in 1950, 1960, 1970 or 1980. The message will be received by a machine which will print it out on a postcard, stamp it, and then drop it into a chute to an outgoing mailbox.
Your friend offers you the chance to send a message, but it can’t be longer than a tweet: 140 characters. You can send it to any of those dates and it will be mailed to the person of your choosing (the address is handled separately from the tweet and will not affect the length of the msg you can send, but it also can not contain non-address information or the postcard will not be stamped and mailed, just discarded. Also, you can only do one for technical reasons he can’t explain. Your friend also tells you to keep in mind that most of the messages sent so far have been discarded by the recipients for various reasons.
Do you send a tweet? Who do you send it to, and when? What steps do you take to ensure it won’t be laughed off or ignored?