I look up and reply historic bitcoin prices if you tag me and use the word tag to reply to an old tweet.
E.g. write: @BTCPriceTag tag.
@BTChap is my daddy.
Okay try this: If you have an old tweet from someone you can reply with @BTCPriceTag and my cute little bot will look up the #bitcoin close price of the day the initial tweet was sent and reply both, the current and the historic price. I believe that is going to be fun ;)