Magazine world view

• Twitter racks up 44.5m global users (Brand Republic)
• Teens don't tweet: Twitter growth not fuelled by youth (Brand Republic)
• Magazine Innovation in Practice: Maggwire, the iTunes for magazines? (Mr. Magazine)
• AMI Brings Natural Health, Fit Pregnancy Under New Umbrella (Folio:)
• Rain or snow? No problem, but revenue shortfalls cripple the Postal Service (Daily Finance)
• Playboy Reports $8.7M second quarter loss (Folio:)
• Summit Business Media sells art group (Folio:)
• Cygnus files for Chapter 11 (Folio:)
• Dawson sells off news distribution assets for £2m (Press Gazette)