diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index 3b8339b..d32bfb2 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -844,6 +844,9 @@ class Event(models.Model):
         for attr in Event.data_fields(all=True, local_img=False, exact_location=False):
             values = [getattr(e, attr) for e in events]
             values = ["" if v is None else v for v in values]
+            # only consider fixed part of Facebook urls
+            if attr == "image":
+                values = [v.split("?")[0] if "fbcdn.net" in v else v for v in values]
 
             if len(set([str(v) for v in values])) == 1:
                 result.append({"similar": True, "key": attr, "values": values[0]})