FILE - In this Feb. 2, 2013, file photo, a smartphone display shows the Twitter logo in Berlin, Germany, Twitter unsealed the documents Thursday, Oct. 3, 2013, for its planned initial public offering of stock and says it hopes to raise up to $1 billion. (AP Photo/dpa, Soeren Stache, File)

What do tweets say about our health?

Tapping into the Twitter stream could help researchers understand how healthy people's lifestyles are and how to target improved public health, according to a recent study.