Online Ad Industry:

• comScore Study: A third of ad impressions are never seen.

Social Media:

• Foursquare now displays pricing menus powered by SinglePlatform.

Search:

• Why search marketers must use AdWords ad extensions.

Legal/Regulatory:

• Sopa and Pipa protests not over, says Wikipedia.

• EU moves early on Google antitrust probe.

• Ron Paul campaign sues to stop unauthorized web videos.

Broadband:

• AT&T data plans ramp to $20, $30, and $50.

Mobile Computing:

• Android 4.0 for tablets still needs work.

• Analyst: At least 48 million iPads will be sold in 2012.

• Amazon Kindle Fire: More profitable than expected?

Security:

• McAfee to plug spam hole this week.

Online Video:

• BitTorrent testing peer-to-peer video streaming.