The folks over at Sophos have released their mid year report on security threats: Sophos Mid-Year 2011 Security Threat Report [PDF] (free registration required to view).

Some highlights include:

• 60% increase in malware over 2010, with Sophos seeing more than 150,000 new malware samples daily
• 19,000 malicious webpages identified daily, with 80% being pages on legitimate websites that have been hacked or compromised
• 81% of people surveyed by Sophos said Facebook posed the biggest social networking risk with increased amounts of scams, click-jacking, survey spam, and identity theft
• 30% of all malware detected by Sophos served via black hat SEO poisoning

For those in a hurry, Naked Security have a short summary available.