diff --git a/src/calibre/ebooks/metadata/mobi.py b/src/calibre/ebooks/metadata/mobi.py
index 74db3b3a58..2da9f74961 100644
--- a/src/calibre/ebooks/metadata/mobi.py
+++ b/src/calibre/ebooks/metadata/mobi.py
@@ -330,9 +330,11 @@ class MetadataUpdater(object):
             prefs = load_defaults('mobi_output')
             pas = prefs.get('prefer_author_sort', False)
             kindle_pdoc = prefs.get('personal_doc', None)
+            share_not_sync = prefs.get('share_not_sync', False)
         except:
             pas = False
             kindle_pdoc = None
+            share_not_sync = False
         if mi.author_sort and pas:
             authors = mi.author_sort
             update_exth_record((100, normalize(authors).encode(self.codec, 'replace')))
@@ -376,7 +378,7 @@ class MetadataUpdater(object):
         # Add a 113 record if not present to allow Amazon syncing
         if (113 not in self.original_exth_records and
                 self.original_exth_records.get(501, None) == 'EBOK' and
-                not added_501):
+                not added_501 and not share_not_sync):
             from uuid import uuid4
             update_exth_record((113, str(uuid4())))
         if 503 in self.original_exth_records:
diff --git a/src/calibre/ebooks/mobi/output.py b/src/calibre/ebooks/mobi/output.py
index 4f5d09c894..f22015d71f 100644
--- a/src/calibre/ebooks/mobi/output.py
+++ b/src/calibre/ebooks/mobi/output.py
@@ -55,6 +55,11 @@ class MOBIOutput(OutputFormatPlugin):
                 ' specified directory. If the directory already '
                 'exists, it will be deleted.')
         ),
+        OptionRecommendation(name='share_not_sync', recommended_value=False,
+            help=_('Enable sharing of book content via Facebook etc. '
+                ' on the Kindle. WARNING: Using this feature means that '
+                ' the book will not auto sync its last read position '
+                ' on multiple devices. Complain to Amazon.'))
     ])
 
     def check_for_periodical(self):
diff --git a/src/calibre/ebooks/mobi/writer2/main.py b/src/calibre/ebooks/mobi/writer2/main.py
index 1cda1b14dd..1705a5a342 100644
--- a/src/calibre/ebooks/mobi/writer2/main.py
+++ b/src/calibre/ebooks/mobi/writer2/main.py
@@ -529,9 +529,10 @@ class MobiWriter(object):
 
         if isinstance(uuid, unicode):
             uuid = uuid.encode('utf-8')
-        exth.write(pack(b'>II', 113, len(uuid) + 8))
-        exth.write(uuid)
-        nrecs += 1
+        if not self.opts.share_not_sync:
+            exth.write(pack(b'>II', 113, len(uuid) + 8))
+            exth.write(uuid)
+            nrecs += 1
 
         # Write cdetype
         if not self.is_periodical:
diff --git a/src/calibre/gui2/convert/mobi_output.py b/src/calibre/gui2/convert/mobi_output.py
index f268ac8606..cd1d0430ae 100644
--- a/src/calibre/gui2/convert/mobi_output.py
+++ b/src/calibre/gui2/convert/mobi_output.py
@@ -23,7 +23,7 @@ class PluginWidget(Widget, Ui_Form):
         Widget.__init__(self, parent,
                 ['prefer_author_sort', 'rescale_images', 'toc_title',
                     'mobi_ignore_margins', 'mobi_toc_at_start',
-                'dont_compress', 'no_inline_toc',
+                'dont_compress', 'no_inline_toc', 'share_not_sync',
                 'personal_doc']#, 'mobi_navpoints_only_deepest']
                 )
         self.db, self.book_id = db, book_id
diff --git a/src/calibre/gui2/convert/mobi_output.ui b/src/calibre/gui2/convert/mobi_output.ui
index 7643d791f3..68cd55ab95 100644
--- a/src/calibre/gui2/convert/mobi_output.ui
+++ b/src/calibre/gui2/convert/mobi_output.ui
@@ -75,6 +75,13 @@
         </item>
        </layout>
       </item>
+      <item>
+       <widget class="QCheckBox" name="opt_share_not_sync">
+        <property name="text">
+         <string>Enable sharing of book content via Facebook, etc. WARNING: Disables last read syncing</string>
+        </property>
+       </widget>
+      </item>
       <item>
        <spacer name="verticalSpacer">
         <property name="orientation">