diff --git a/lib/socials/__tests__/normalizeProfileUrl.test.ts b/lib/socials/__tests__/normalizeProfileUrl.test.ts
index f501e75f..1184feee 100644
--- a/lib/socials/__tests__/normalizeProfileUrl.test.ts
+++ b/lib/socials/__tests__/normalizeProfileUrl.test.ts
@@ -9,7 +9,7 @@ describe("normalizeProfileUrl", () => {
   });
 
   it("removes http:// protocol from URL", () => {
-    expect(normalizeProfileUrl("http://twitter.com/user")).toBe("twitter.com/user");
+    expect(normalizeProfileUrl("http://twitter.com/user")).toBe("x.com/user");
   });
 
   it("returns URL unchanged if no protocol", () => {
@@ -40,6 +40,33 @@ describe("normalizeProfileUrl", () => {
   });
 
   it("handles URL with www. but without protocol", () => {
-    expect(normalizeProfileUrl("www.twitter.com/user")).toBe("twitter.com/user");
+    expect(normalizeProfileUrl("www.twitter.com/user")).toBe("x.com/user");
+  });
+
+  it("canonicalizes twitter.com to x.com (chat#1851)", () => {
+    expect(normalizeProfileUrl("https://twitter.com/ashnikko")).toBe("x.com/ashnikko");
+    expect(normalizeProfileUrl("https://www.twitter.com/KETTAMA_/")).toBe("x.com/KETTAMA_");
+    expect(normalizeProfileUrl("twitter.com/disclosure")).toBe("x.com/disclosure");
+  });
+
+  it("produces the same key for twitter.com and x.com spellings", () => {
+    expect(normalizeProfileUrl("https://x.com/Foo")).toBe(
+      normalizeProfileUrl("https://twitter.com/Foo"),
+    );
+  });
+
+  it("leaves x.com URLs unchanged", () => {
+    expect(normalizeProfileUrl("https://x.com/ashnikko")).toBe("x.com/ashnikko");
+  });
+
+  it("does not rewrite domains that merely contain twitter.com", () => {
+    expect(normalizeProfileUrl("https://nottwitter.com/user")).toBe("nottwitter.com/user");
+    expect(normalizeProfileUrl("https://example.com/twitter.com/user")).toBe(
+      "example.com/twitter.com/user",
+    );
+  });
+
+  it("canonicalizes a bare twitter.com domain with no path", () => {
+    expect(normalizeProfileUrl("https://twitter.com")).toBe("x.com");
   });
 });
diff --git a/lib/socials/normalizeProfileUrl.ts b/lib/socials/normalizeProfileUrl.ts
index 2d45a231..667913e1 100644
--- a/lib/socials/normalizeProfileUrl.ts
+++ b/lib/socials/normalizeProfileUrl.ts
@@ -1,15 +1,22 @@
 /**
- * Normalizes a profile URL by removing the protocol, www. prefix, and trailing slash.
+ * Normalizes a profile URL by removing the protocol, www. prefix, and trailing slash,
+ * and canonicalizing domain aliases so equivalent profiles produce one upsert key.
  * This ensures consistent URL format for database queries and storage.
  *
+ * Domain aliases: `twitter.com` → `x.com` (official domain, and what the Apify
+ * actor echoes). Without this, scrape write-backs land on an `x.com/*` twin row
+ * while artists stay connected to a stale `twitter.com/*` row (chat#1851).
+ *
  * @param url - The profile URL to normalize
  * @returns The normalized URL without protocol, www., or trailing slash
  */
 export function normalizeProfileUrl(url: string | null | undefined): string {
   if (!url) return "";
 
-  return url
+  const stripped = url
     .replace(/^https?:\/\//, "")
     .replace(/^www\./, "")
     .replace(/\/$/, "");
+
+  return stripped.replace(/^twitter\.com(\/|$)/i, "x.com$1");
 }