Connections has a REST API that allows you to get user profile information, publish activities and many other tasks. If you create a service description for these REST APIs then FEB could interact directly with them.
I took some time to create a few of the service descriptions, but there are many more that could be created. The full article I wrote is http://www-10.lotus.com/ldd/lfwiki.nsf/dx/Create_Service_Description_For_Connections_Profiles_API
Connections - Create Blog Entry - Creates an entry in a Blog.
I have created another service description that integrates with Connections. This one enables a FEB app to create a Blog entry.
May 26, 2015 - Connections Community - Create Event - Creates an event in a community calendar. To read more about the Connections REST API function check out the documentation for creating community events.
Added a Service Description XML file (Connections_Event_Create.xml) for a service to Create an Event in a Connection Community and a sample application (ConnectionsCommunityEvents.nitro_s) demonstrating its use.
Mar 5,2015 - Create Community - Creates a new Community
Get Communities - Returns the communities for the specified user.
Added Two more Service Description XML files that can be used to get a user's Community List and also programmatically create a community: Connections_GetCommunities.xml and Connections_CreateNewCommunity.xml
Mar 24th - Add Community Member - Adds a member to a community.
Added a service description, that can be used to add a user to a community and updated the sample application.
Connections_AddCommunityMember.xml
For more information on this REST API reference:
There is also a Sample Leap Application that uses the three services.