In addition to the new designer, Burberry also stepped up its involvement in social media, relationships with style magazines and connecting with high-profile trendsetters. This is an example of which concept?

Reaching efforts focused on building relationships and adding customers

Explanation:

Reaching efforts is a process where a company adds more sources of service inputs to increase the scale of a specific activity. The process involved sets of activities like identifying sources, analysis this sources and selecting them.

For Burberry company in this given case, it can be concluded reaching efforts techniques is implemented as new sources is used for their promotional adverts and focuses were on relationship building with style magazines and profiled high level trend setters.