A new extension for WPSSO called WPSSO Tweet a Quote (WPSSO TAQ) is available to include Twitter-style quotes in your content, with an easy (and optional) Tweet link for readers.
[taq]WPSSO Tweet a Quote – Easily add Tweetable quotes to your WordPress content! ;-)[/taq]
WPSSO TAQ uses your existing WPSSO settings to shorten URLs, add the Twitter Business @username, and recommend the author’s @username after sharing — and developers / advanced users will appreciate the ability to completely re-style the quote text and Tweet link. ;-)