SecureMac is celebrating the release of MacScan 2.9.1, the latest version of it’s award-winning anti-malware privacy and security software for Mac OS X. The Download, Tweet and Win! Campaign allows Mac users the opportunity to download MacScan and audit their computer for security threats and privacy issues such as tracking cookies and tweet their results for a chance to win great prizes such as a MacBook Air, MacScan licenses and gift cards to favorite retailers. No purchase is necessary.