How do I cite a Twitter feed in a footnote?

Good question, I guess, but I fear the future long term retrieval issues.

Also, this line is included "you can incorporate the facts into a sentence" in the answer.

The facts?  In a tweet?

There are no facts in tweets! ;)

Reference:
http://www.chicagomanualofstyle.org/CMS_FAQ/Documentation/Documentation01.html