diff --git a/server/controllers/client.js b/server/controllers/client.js
index 68ffdbcd5..746c9b62b 100644
--- a/server/controllers/client.js
+++ b/server/controllers/client.js
@@ -33,25 +33,36 @@ module.exports = router
 // ---------------------------------------------------------------------------
 
 function addOpenGraphTags (htmlStringPage, video) {
-  const thumbnailUrl = constants.CONFIG.WEBSERVER.URL + video.thumbnailPath
   const videoUrl = constants.CONFIG.WEBSERVER.URL + '/videos/watch/'
+  let baseUrlHttp
+
+  if (video.isOwned()) {
+    baseUrlHttp = constants.CONFIG.WEBSERVER.URL
+  } else {
+    baseUrlHttp = constants.REMOTE_SCHEME.HTTP + '://' + video.podUrl
+  }
+
+  // We fetch the remote preview (bigger than the thumbnail)
+  // This should not overhead the remote server since social websites put in a cache the OpenGraph tags
+  // We can't use the thumbnail because these social websites want bigger images (> 200x200 for Facebook for example)
+  const previewUrl = baseUrlHttp + constants.STATIC_PATHS.PREVIEWS + video.getPreviewName()
 
   const metaTags = {
     'og:type': 'video',
     'og:title': video.name,
-    'og:image': thumbnailUrl,
+    'og:image': previewUrl,
     'og:url': videoUrl,
     'og:description': video.description,
 
     'name': video.name,
     'description': video.description,
-    'image': thumbnailUrl,
+    'image': previewUrl,
 
     'twitter:card': 'summary_large_image',
     'twitter:site': '@Chocobozzz',
     'twitter:title': video.name,
     'twitter:description': video.description,
-    'twitter:image': thumbnailUrl
+    'twitter:image': previewUrl
   }
 
   let tagsString = ''
diff --git a/server/helpers/custom-validators/videos.js b/server/helpers/custom-validators/videos.js
index 166158ef3..45acb7686 100644
--- a/server/helpers/custom-validators/videos.js
+++ b/server/helpers/custom-validators/videos.js
@@ -31,7 +31,7 @@ function isEachRemoteVideosValid (requests) {
         isVideoDateValid(video.createdDate) &&
         isVideoDescriptionValid(video.description) &&
         isVideoDurationValid(video.duration) &&
-        isVideoMagnetValid(video.magnetUri) &&
+        isVideoMagnetValid(video.magnet) &&
         isVideoNameValid(video.name) &&
         isVideoPodUrlValid(video.podUrl) &&
         isVideoTagsValid(video.tags) &&
@@ -63,7 +63,7 @@ function isVideoDurationValid (value) {
 }
 
 function isVideoMagnetValid (value) {
-  return validator.isLength(value.infoHash, VIDEOS_CONSTRAINTS_FIELDS.MAGNET.XT)
+  return validator.isLength(value.infoHash, VIDEOS_CONSTRAINTS_FIELDS.MAGNET.INFO_HASH)
 }
 
 function isVideoNameValid (value) {
diff --git a/server/initializers/constants.js b/server/initializers/constants.js
index 55129fa3e..c808aff5f 100644
--- a/server/initializers/constants.js
+++ b/server/initializers/constants.js
@@ -67,7 +67,7 @@ const CONSTRAINTS_FIELDS = {
     NAME: { min: 3, max: 50 }, // Length
     DESCRIPTION: { min: 3, max: 250 }, // Length
     MAGNET: {
-      XT: { min: 10 } // Length
+      INFO_HASH: { min: 10, max: 50 } // Length
     },
     DURATION: { min: 1, max: 7200 }, // Number
     TAGS: { min: 1, max: 3 }, // Number of total tags
diff --git a/server/models/video.js b/server/models/video.js
index 4f2be5c96..0da2cb8ab 100644
--- a/server/models/video.js
+++ b/server/models/video.js
@@ -160,7 +160,7 @@ function generateMagnetUri () {
     baseUrlHttp = constants.CONFIG.WEBSERVER.URL
     baseUrlWs = constants.CONFIG.WEBSERVER.WS + '://' + constants.CONFIG.WEBSERVER.HOSTNAME + ':' + constants.CONFIG.WEBSERVER.PORT
   } else {
-    baseUrlHttp = constants.REMOTE_SCHEME.HTTP + this.podUrl
+    baseUrlHttp = constants.REMOTE_SCHEME.HTTP + '://' + this.podUrl
     baseUrlWs = constants.REMOTE_SCHEME.WS + this.podUrl
   }