The Ticker: #4sqDay; Campaign ads on PBS; Second screen viewing; Read it Later; Read more books

VentureBeatFoursquare confirms 20M users, 2 billion check-ins, on 4sqDay 2012

Mother JonesAre Campaign Ads Coming to PBS?

Multichannel NewsTablets Are Clear Go-To Alternative To TV: Study; Device Owners Say 15% of Their Full-Length TV Show Viewing Is on Tablets

PoynterRead it Later founder: Paid apps ‘do not make sense for our business’

LifehackerHow to Fit Reading Into Your Schedule and Actually Finish the Books You Want to Read