First pass at the social/federated chat component. Closes #2172

web/interfaces/chat-social-message.model.ts

@@ -0,0 +1,8 @@
+import { SocketEvent } from './socket-events';
+
+export interface ChatSocialMessage extends SocketEvent {
+  title: string;
+  body: string;
+  image: string;
+  link: string;
+}