Week in review: Twitter turns 7

The following is a roundup of my stories from Investor’s Business Daily at Investors.com.

Twitter zinged for its Birthday Video; Yahoo and Wal-Mart also mocked in Friday Funnies. (March 28, 2013)

BlackBerry’s Q4 results fail to quell skeptics. (March 28, 2013)

BlackBerry surprises with Q4 profit; stock rises. (March 28, 2013)

AT&T and China Mobile lead 4G wireless spending spree. (March 22, 2013)

Photo: Twitter logo