You can create a #Group in order to share information and posts with certain users.
In general, groups can contain specific topic. Users who are interested in that topic both can see posts that are shared by other users in that regard and in case of having access, they can share their posts with the other users inside the group.
If you are thinking now about an interesting topic, create another one and invite your network.
EPPN supports hashtag [a type of metadata tag] in the sharing, - A hashtag allowing users to apply dynamic, user-generated tagging that makes it possible for others to easily find messages with a specific theme or content; it allows easy, informal markup of folk taxonomy without need of any formal taxonomy or markup language.
(i.e.) the hashtag #yourkeyword allows users to find all the posts that have been tagged using that hashtag.