diff --git a/datasources/schemas/tags/base.schema.json b/datasources/schemas/tags/base.schema.json
index 7055904..82a4d4a 100644
--- a/datasources/schemas/tags/base.schema.json
+++ b/datasources/schemas/tags/base.schema.json
@@ -52,13 +52,16 @@
             }
         },
         "facebook": {
-            "type": "string"
+            "type": "string",
+            "format": "uri"
         },
         "twitter": {
-            "type": "string"
+            "type": "string",
+            "format": "uri"
         },
         "instagram": {
-            "type": "string"
+            "type": "string",
+            "format": "uri"
         },
         "contact:linkedin": {
             "type": "string"
diff --git a/datasources/transforms/osm_tags.rb b/datasources/transforms/osm_tags.rb
index 839b873..76197da 100755
--- a/datasources/transforms/osm_tags.rb
+++ b/datasources/transforms/osm_tags.rb
@@ -63,6 +63,15 @@ def remove_contact_prefix(tags, key, has_flat_addr)
     end
   end
 
+  def tags_to_url(tags)
+    @@url_format.each{ |key, formatter|
+      if tags.include?(key) && !tags[key].start_with?('http')
+        tags[key] = formatter.gsub('$1', tags[key])
+      end
+    }
+    tags
+  end
+
   def process_tags(tags)
     # There is an adresse defined by addr:* ?
     has_flat_addr = tags.keys.find{ |k| k.start_with?('addr:') }
@@ -75,6 +84,8 @@ def process_tags(tags)
       [k, @multiple.include?(k) ? v.split(';').collect(&:strip) : v]
     }.select{ |k, _v| !k.nil? }.to_h
 
+    tags = tags_to_url(tags)
+
     (@@names + %i[addr ref description source]).each{ |key|
       value = tags.delete(key)
       tags = group(key, tags)
@@ -174,4 +185,10 @@ def process_data(row)
     quarter
     block_number
   ]
+
+  @@url_format = {
+    facebook: 'https://www.facebook.com/$1',
+    twitter: 'https://twitter.com/$1',
+    instagram: 'https://www.instagram.com/$1',
+  }
 end
diff --git a/tests/osm_tags_test.rb b/tests/osm_tags_test.rb
index f492ee2..0efab65 100644
--- a/tests/osm_tags_test.rb
+++ b/tests/osm_tags_test.rb
@@ -19,9 +19,9 @@ def test_split
   end
 
   def test_contact_social
-    assert_equal({ facebook: 'a' }, map({ facebook: 'a' }))
-    assert_equal({ facebook: 'b' }, map({ 'contact:facebook': 'b' }))
-    assert_equal({ facebook: 'a' }, map({ facebook: 'a', 'contact:facebook': 'b' }))
+    assert_equal({ facebook: 'https://www.facebook.com/a' }, map({ facebook: 'a' }))
+    assert_equal({ facebook: 'https://www.facebook.com/b' }, map({ 'contact:facebook': 'b' }))
+    assert_equal({ facebook: 'https://www.facebook.com/a' }, map({ facebook: 'a', 'contact:facebook': 'b' }))
   end
 
   def test_contact_addr
@@ -40,4 +40,9 @@ def test_default_name
     assert_equal({ name: { 'fr' => 'a' }, alt_name: { 'fr' => 'a' } }, map({ 'alt_name' => 'a' }))
     assert_equal({ name: { 'fr' => 'a', 'de' => 'b' }, alt_name: { 'de' => 'b' } }, map({ 'name:fr' => 'a', 'alt_name:de' => 'b' }))
   end
+
+  def test_url_formatter
+    assert_equal({ facebook: 'https://www.facebook.com/a' }, map({ 'facebook' => 'a' }))
+    assert_equal({ facebook: 'https://face.book' }, map({ 'facebook' => 'https://face.book' }))
+  end
 end