Online Ad Market:

• Google Q1 strong on YouTube display ads, paid clicks.

• Inadco emerges from stealth as the 'AdSense For Leads'.

• The secret history of ads in books.

Social Media:

• 2011: the year the check-in died.

Legal/Regulatory:

• Google, Facebook Group asks delay of debit-card fee rules.

• Google denies lying about Apps' certification.

Research & Stats:

• Do social networks make you feel left out?

Mobile Computing:

• T-Mobile's new plans get official: starting at $60 for unlimited everything, throttling included.

Publishing:

• Sugar gets $15 million in new funding.

Business Strategies:

• Intuit aims to spur growth with mobile software, acquisitions.

• Microsoft launches StreetView rival in Europe.

Pearls of Wisdom:

• It's Hispanic, it's direct but does it work?