diff --git a/src/models/europython.py b/src/models/europython.py
index 689200b..c6b381d 100644
--- a/src/models/europython.py
+++ b/src/models/europython.py
@@ -241,39 +241,59 @@ def _clean_social_input(text: str) -> str | None:
         removes "http://" or "https://",
         removes "www." prefix,
         removes "@" prefix,
+        removes invisible Unicode control characters,
         and decodes URL-encoded characters.
         """
         if EuroPythonSpeaker._is_blank_or_na(text):
             print(f"Blank or N/A input: {text}")
             return None
 
+        # Strip leading/trailing whitespace
         text = text.strip()
 
-        # Handle inputs like "LinkedIn: https://linkedin.com/in/username"
-        # or "GH: https://github.com/username"
+        # Remove any text prefix like "LinkedIn: " or "GH: "
         text = text.split(" ", 1)[1] if ": " in text else text
 
+        # Remove query strings and trailing commas or slashes
         text = text.split("?", 1)[0]
         text = text.split(",", 1)[0]
         text = text.rstrip("/")
 
+        # Remove URL schemes
         if text.startswith("https://"):
             text = text[8:]
         elif text.startswith("http://"):
             text = text[7:]
 
+        # Remove "www." prefix
         if text.startswith("www."):
             text = text[4:]
 
-        # Remove @ if present
+        # Remove leading @
         if text.startswith("@"):
             text = text[1:]
 
-        # Percent-encode non-ASCII characters
+        # Remove invisible Unicode control characters (Bidi, LTR/RTL marks, etc.)
+        invisible_chars = [
+            "\u200e",
+            "\u200f",  # LTR / RTL marks
+            "\u202a",
+            "\u202b",
+            "\u202c",
+            "\u202d",
+            "\u202e",  # Directional overrides
+            "\u2066",
+            "\u2067",
+            "\u2068",
+            "\u2069",  # Isolates
+        ]
+        text = re.sub(f"[{''.join(invisible_chars)}]", "", text)
+
+        # Percent-encode if needed (e.g., non-ASCII chars)
         if not text.isascii():
             text = quote(text, safe="@/-_.+~#=:")
 
-        return text.lower()
+        return text.lower() if text else None
 
 
 class EuroPythonSession(BaseModel):
@@ -292,7 +312,7 @@ class EuroPythonSession(BaseModel):
     duration: str = ""
     level: str = ""
     delivery: str = ""
-    resources: list[dict[str, str]] | None = None
+    resources: list[dict[str, str | None]] | None = None
     room: str | None = None
     start: datetime | None = None
     end: datetime | None = None
diff --git a/src/models/pretalx.py b/src/models/pretalx.py
index 560db85..f5a56c3 100644
--- a/src/models/pretalx.py
+++ b/src/models/pretalx.py
@@ -63,7 +63,7 @@ class PretalxSubmission(BaseModel):
     state: SubmissionState
     abstract: str = ""
     duration: str = ""
-    resources: list[dict[str, str]] | None = None
+    resources: list[dict[str, str | None]] | None = None
     answers: list[PretalxAnswer]
     slots: list[PretalxSlot] = Field(default_factory=list, exclude=True)
     slot_count: int = Field(..., exclude=True)
diff --git a/tests/test_extract_socials.py b/tests/test_extract_socials.py
index f273182..ed6d8f5 100644
--- a/tests/test_extract_socials.py
+++ b/tests/test_extract_socials.py
@@ -65,6 +65,7 @@ def test_extract_linkedin_url(input_string, result):
 @pytest.mark.parametrize(
     ("input_string", "result"),
     [
+        ("@user.dev", "https://bsky.app/profile/user.dev"),
         ("user123", "https://bsky.app/profile/user123.bsky.social"),
         ("@user123", "https://bsky.app/profile/user123.bsky.social"),
         ("user123.bsky.social", "https://bsky.app/profile/user123.bsky.social"),