diff --git a/linkedin/linkedin.py b/linkedin/linkedin.py
index 5c3a1b0..4fabf17 100644
--- a/linkedin/linkedin.py
+++ b/linkedin/linkedin.py
@@ -291,16 +291,16 @@ def leave_group(self, group_id):
         raise_for_error(response)
         return True
 
-    def submit_group_post(self, group_id, title, summary, submitted_url,
-                          submitted_image_url, content_title, description):
-        post = {
-            'title': title, 'summary': summary,
-            'content': {
+    def submit_group_post(self, group_id, title, summary, submitted_url=None,
+                          submitted_image_url=None, content_title=None,
+                          description=None):
+        post = {'title': title, 'summary': summary}
+        if content_title and submitted_url:
+            post['content'] = {
                 'submitted-url': submitted_url,
                 'title': content_title,
                 'description': description
             }
-        }
         if submitted_image_url:
             post['content']['submitted-image-url'] = submitted_image_url
 
@@ -541,3 +541,42 @@ def like_update(self, update_key, is_liked=True):
         response = self.make_request('PUT', url, data=json.dumps(is_liked))
         raise_for_error(response)
         return True
+
+    def get_post_likes(self, post_id, selectors=None, params=None,
+                       headers=None):
+        url = '%s/%s/likes' % (ENDPOINTS.POSTS, post_id)
+        if selectors:
+            url = '%s:(%s)' % (url, LinkedInSelector.parse(selectors))
+
+        response = self.make_request('GET', url, params=params, headers=headers)
+        raise_for_error(response)
+        return response.json()
+
+    def get_share_comments(self, post_id, selectors=None, params=None,
+                           headers=None):
+        url = '%s/~/network/updates/key=%s/update-comments' % (ENDPOINTS.PEOPLE,
+                                                               post_id)
+        if selectors:
+            url = '%s:(%s)' % (url, LinkedInSelector.parse(selectors))
+
+        response = self.make_request('GET', url, params=params, headers=headers)
+        raise_for_error(response)
+        return response.json()
+
+    def get_share_likes(self, post_id, selectors=None, params=None,
+                        headers=None):
+        url = '%s/~/network/updates/key=%s/likes' % (ENDPOINTS.PEOPLE, post_id)
+        if selectors:
+            url = '%s:(%s)' % (url, LinkedInSelector.parse(selectors))
+
+        response = self.make_request('GET', url, params=params, headers=headers)
+        raise_for_error(response)
+        return response.json()
+
+    def comment_as_company(self, company_id, update_key, comment):
+        comment = {'comment': comment}
+        url = '%s/updates/key=%s/update-comments-as-company' % (
+            ENDPOINTS.COMPANIES, company_id, update_key)
+        response = self.make_request('PUT', url, data=json.dumps(comment))
+        raise_for_error(response)
+        return True