diff --git a/tests/core/test_ld.py b/tests/core/test_ld.py
new file mode 100644
index 0000000..bb465e1
--- /dev/null
+++ b/tests/core/test_ld.py
@@ -0,0 +1,28 @@
+import datetime
+
+from core.ld import parse_ld_date
+
+
+def test_parse_ld_date():
+    """
+    Tests that the various kinds of LD dates that we see will work
+    """
+    assert parse_ld_date("2022-11-16T15:57:58Z") == datetime.datetime(
+        2022,
+        11,
+        16,
+        15,
+        57,
+        58,
+        tzinfo=datetime.timezone.utc,
+    )
+
+    assert parse_ld_date("2022-11-16T15:57:58.123Z") == datetime.datetime(
+        2022,
+        11,
+        16,
+        15,
+        57,
+        58,
+        tzinfo=datetime.timezone.utc,
+    )
diff --git a/users/models/inbox_message.py b/users/models/inbox_message.py
index 079c572..0bf6851 100644
--- a/users/models/inbox_message.py
+++ b/users/models/inbox_message.py
@@ -79,6 +79,12 @@ class InboxMessageStates(StateGraph):
                             raise ValueError(
                                 f"Cannot handle activity of type delete.{unknown}"
                             )
+            case "add":
+                # We are ignoring these right now (probably pinned items)
+                pass
+            case "remove":
+                # We are ignoring these right now (probably pinned items)
+                pass
             case unknown:
                 raise ValueError(f"Cannot handle activity of type {unknown}")
         return cls.processed