1. But the NSA still collects data on foreigners and, picks up data on Americans on the periphery of that.

2. It was from here, the center of the center, that the Catholic Church brought the periphery under its sway.

3. In the age of social media, fans have an unprecedented opportunity to actively engage in the periphery of a sporting event.

4. Shiite militias entered other mainly Sunni cities after agreeing to remain on the periphery, and clashed with residents.