diff --git a/migrations/20130128_remove_dummy_accounts.js b/migrations/20130128_remove_dummy_accounts.js
new file mode 100644
index 0000000000..964c307206
--- /dev/null
+++ b/migrations/20130128_remove_dummy_accounts.js
@@ -0,0 +1,19 @@
+// run with %mongo server:port/dbname node_modules/moment/moment.js migrations/my_commands.js
+var unRegistered = { 'auth.local': { $exists: false }, 'auth.facebook': { $exists: false} },
+    registered = { $or: [
+        { 'auth.local': { $exists: true } },
+        { 'auth.facebook': { $exists: true} }
+    ]};
+db.users.count(registered);
+db.users.count(unRegistered);
+db.users.find(unRegistered).forEach(function(user) {
+    var lastCron = new Date(user.lastCron),
+        today = new Date(),
+        diff = Math.abs(moment(today).sod().diff(moment(lastCron).sod(), 'days'));
+
+    if (diff > 30) {
+        db.users.remove({ _id: user._id });
+    }
+});
+db.users.count(registered);
+db.users.count(unRegistered);
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