The Washington Post has an interesting blog post about news organizations using SEC documents as fact checking tools. SEC filings were used by various news organizations to pinpoint Romney's retirement from Bain. This little bit may explain why the #retroactively hashtag has been trending on twitter:
Romney’s sudden departure from Bain had left the partnership in flux, in fact almost breaking up the firm, and a final resolution was not reached until he ended his Olympic sojourn and decided to run for governor. At that point, he signed retirement papers that set his departure date as February 1999, the month he left for the Olympics.
Maybe #retroactively shouldn't be a Twitter hashtag joke afterall.