From the LinkedIn Blog:
Every day millions of professionals are using LinkedIn to share their experiences, opinions and perspectives on a wide variety of topics. All of this professional knowledge is literally at your fingertips with our new content search feature on the LinkedIn mobile app. Members can now search for any topic and find relevant articles published on LinkedIn, either by third-parties, or shared by other members in their feed.
The blog post continues with info on three new search options:
1. Search Your Own LinkedIn feed.
2. Search For Items on Specific Topics
3. Search Hashtags That are Included in Posts
What About Privacy?
The privacy settings you specify when you post or write an article are honored in our search results, i.e., if you share your post with your connections only, only they will be able to retrieve your post via search. Conversely, your search results contain public posts and posts shared by your connections. The same rules apply to hashtag search.