The best stories across the web on media and technology, curated by Lily Leung.

1. Is CNN buying social-media news site Mashable? (PaidContent)

2. Amazon sells more than 2 million copies of Kindle mini e-books (PaidContent)

3. Company launches SXSW Social Viewer to bring real-time conversation to devices (Lost Remote)

4. Gawker will allow commenters to police other commenters (AllThingsD)

5. Media leaders craft a code of conduct for aggregators (New York Times)

6. What ‘Downton Abbey’ can teach us about the rise of mobile and social media (Online Media Daily)