diff --git a/robot.sh b/robot.sh
index e0c42ad..4f1b864 100755
--- a/robot.sh
+++ b/robot.sh
@@ -8,8 +8,10 @@ export TMP_PATH=$APPS_PATH/../tmp
 export DATA_PATH=$APPS_PATH/../data
 export FLAG_PATH=$APPS_PATH/../flags
 
+export TS=`date +%s`
 export MINUTE=`date +%M | sed 's/^0*//'`
 export DATE=`date +%Y%m%d0000`
+export DATEHOUR=`date +%Y%m%d%H`
 
 #
 # Synchronize the Blockchain
diff --git a/scripts/tweet.sh b/scripts/tweet.sh
index 982bf42..f9829c2 100755
--- a/scripts/tweet.sh
+++ b/scripts/tweet.sh
@@ -70,8 +70,11 @@ fi
 # tweet Topisto : empty blocks
 $APPS_PATH/twitter/emptybot/robot.sh 2>&1
 
-TWEET=8
-if [ $((MINUTE % $TWEET)) -eq 0 ]
+# tweet frequency : 2 Hours
+#TWEETFREQ=7200
+#if [ $((TS % $TWEETFREQ)) -eq 0 ]
+# Tweet freq : One per Hour
+if [ ! -f $DATA_PATH/twitterbot/$DATEHOUR ]
 then
   debug "send a TWEET"
 
@@ -80,6 +83,8 @@ then
 
   # "auto likes" from Topisto
   $APPS_PATH/twitter/likebot/robot.sh 2>&1
+
+  touch $DATA_PATH/twitterbot/$DATEHOUR
 else
   debug "skip TWEET"
 fi
diff --git a/twitter/twitterbot/robot.sh b/twitter/twitterbot/robot.sh
index a7c7081..b8a16d9 100755
--- a/twitter/twitterbot/robot.sh
+++ b/twitter/twitterbot/robot.sh
@@ -14,19 +14,17 @@ cd $APPS_PATH/twitter/twitterbot
 #
 # Tweet pour un assemblage de hash
 #
-for fichier in `ls $DATA_PATH/hashes2hashes/*.png`
+for fichier in `ls -tr $DATA_PATH/hashes2hashes/*.png`
 do
-  BLOCK=`basename $fichier .png`
-  if [ ! -f $DATA_PATH/twitterbot/assemblage_$BLOCK ]
-  then
-    php robot.php $BLOCK CONFIRMED hashes2hashes
-    touch $DATA_PATH/twitterbot/assemblage_$BLOCK
-    #rm -f $flag
-    #exit 0
-    sleep 30
-  fi
+  BLOCK_HASH=`basename $fichier .png`
 done
 
+if [ 5 -gt $((RANDOM % 100)) ]
+then
+  php robot.php $BLOCK_HASH CONFIRMED hashes2hashes
+  touch $DATA_PATH/twitterbot/$BLOCK_HASH
+fi
+
 #
 # Se lancer pour un tweet sur un block unique
 #