1. Google Ngram Viewer allows you to search and plot words appearing in books from 1800-2008 — and has just rolled out some new features. The new wildcard feature allows you to find which words appear alongside others. Above, I’ve plotted which noun appears most frequently after “social network.” From about 1990 on, the answer is “analysis” as mapping social connections becomes more an established internet-era discipline.
2. Facebook announced that teens 13-17 will have the ability to share posts publicly, as they do on platforms like Twitter. Unlike Twitter, Facebook has a real names policy that may result in more real world consequences for teens.
3. Lots of high stakes digital project failures in the media this week, from the heavily covered healthcare.gov to the buggy first release of the college admissions Common App. These projects are complex, with data and system integration challenges, multiple stakeholders, and large, public constituencies.
4. When do Americans use mobile apps? News app usage peaks around 7am, while entertainment and games get big at 9 pm. And it turns out we’re surprisingly heavy consumers of mobile apps throughout the weekend.
5. As the world goes mobile, so does YouTube. Mobile on Youtube is now 40% of all video views from 25%  in 2012 and 6% in 2011. Starting in November, an upcoming YouTube mobile release will allow users to save and watch videos offline.

Weekend fun: Conquer your acrophobia and bring Peg Man down to Earth by playing Map Dive.

Every Friday, find five, highly subjective links about compelling technologies, emerging trends, and interesting ideas that affect how we live and work digitally.