Four short links: 23 March 2012: Walmart Buys A Facebook App for Calendar Access (Ars Technica) -- The Social Calendar app and its file of 110 million birthdays and other events, acquired from Newput Corp., will give Walmart the ability to expand its efforts to dig deeper into the lives of customers. Interesting to think that by buying a well-loved app, a company could get access to your Facebook details whether you Like them or not.