diff --git a/blocks/blog_tags/block_blog_tags.php b/blocks/blog_tags/block_blog_tags.php
index de32984c8ae..6edc7b5dff4 100644
--- a/blocks/blog_tags/block_blog_tags.php
+++ b/blocks/blog_tags/block_blog_tags.php
@@ -75,7 +75,7 @@ class block_blog_tags extends block_base {
             }
             return $this->content;
 
-        } else if (empty($CFG->usetags)) {
+        } else if (!core_tag_tag::is_enabled('core', 'post')) {
             $this->content = new stdClass();
             $this->content->text = '';
             if ($this->page->user_is_editing()) {
@@ -126,6 +126,7 @@ class block_blog_tags extends block_base {
                   WHERE t.id = ti.tagid AND p.id = ti.itemid
                         $type
                         AND ti.itemtype = 'post'
+                        AND ti.component = 'core'
                         AND ti.timemodified > $timewithin";
 
         if ($context->contextlevel == CONTEXT_MODULE) {
@@ -195,7 +196,9 @@ class block_blog_tags extends block_base {
                 }
 
                 $blogurl->param('tagid', $tag->id);
-                $link = html_writer::link($blogurl, tag_display_name($tag), array('class'=>$tag->class, 'title'=>get_string('numberofentries','blog',$tag->ct)));
+                $link = html_writer::link($blogurl, core_tag_tag::make_display_name($tag),
+                        array('class' => $tag->class,
+                            'title' => get_string('numberofentries', 'blog', $tag->ct)));
                 $this->content->text .= '<li>' . $link . '</li> ';
             }
             $this->content->text .= "\n</ul>\n";
diff --git a/blocks/tag_flickr/block_tag_flickr.php b/blocks/tag_flickr/block_tag_flickr.php
index 06f691d388d..22471f38eb1 100644
--- a/blocks/tag_flickr/block_tag_flickr.php
+++ b/blocks/tag_flickr/block_tag_flickr.php
@@ -47,7 +47,6 @@ class block_tag_flickr extends block_base {
         global $CFG, $USER;
 
         //note: do NOT include files at the top of this file
-        require_once($CFG->dirroot.'/tag/lib.php');
         require_once($CFG->libdir . '/filelib.php');
 
         if ($this->content !== NULL) {
@@ -56,11 +55,12 @@ class block_tag_flickr extends block_base {
 
         $tagid = optional_param('id', 0, PARAM_INT);   // tag id - for backware compatibility
         $tag = optional_param('tag', '', PARAM_TAG); // tag
+        $tc = optional_param('tc', 0, PARAM_INT); // Tag collection id.
 
-        if ($tag) {
-            $tagobject = tag_get('name', $tag);
-        } else if ($tagid) {
-            $tagobject = tag_get('id', $tagid);
+        if ($tagid) {
+            $tagobject = core_tag_tag::get($tagid);
+        } else if ($tag) {
+            $tagobject = core_tag_tag::get_by_name($tc, $tag);
         }
 
         if (empty($tagobject)) {
@@ -73,7 +73,9 @@ class block_tag_flickr extends block_base {
         //include related tags in the photo query ?
         $tagscsv = $tagobject->name;
         if (!empty($this->config->includerelatedtags)) {
-            $tagscsv .= ',' . tag_get_related_tags_csv(tag_get_related_tags($tagobject->id), TAG_RETURN_TEXT);
+            foreach ($tagobject->get_related_tags() as $t) {
+                $tagscsv .= ',' . $t->get_display_name(false);
+            }
         }
         $tagscsv = urlencode($tagscsv);
 
diff --git a/blocks/tag_flickr/edit_form.php b/blocks/tag_flickr/edit_form.php
index e67e039a7a2..da0a23f5f8d 100644
--- a/blocks/tag_flickr/edit_form.php
+++ b/blocks/tag_flickr/edit_form.php
@@ -36,7 +36,7 @@ class block_tag_flickr_edit_form extends block_edit_form {
         $mform->setType('config_title', PARAM_TEXT);
 
         $mform->addElement('text', 'config_numberofphotos', get_string('numberofphotos', 'block_tag_flickr'), array('size' => 5));
-        $mform->setType('config_numberofvideos', PARAM_INT);
+        $mform->setType('config_numberofphotos', PARAM_INT);
 
         $mform->addElement('selectyesno', 'config_includerelatedtags', get_string('includerelatedtags', 'block_tag_flickr'));
         $mform->setDefault('config_includerelatedtags', 0);
diff --git a/blocks/tag_youtube/block_tag_youtube.php b/blocks/tag_youtube/block_tag_youtube.php
index 7ab13be342c..9c79fe8d982 100644
--- a/blocks/tag_youtube/block_tag_youtube.php
+++ b/blocks/tag_youtube/block_tag_youtube.php
@@ -64,7 +64,6 @@ class block_tag_youtube extends block_base {
         global $CFG;
 
         //note: do NOT include files at the top of this file
-        require_once($CFG->dirroot.'/tag/lib.php');
         require_once($CFG->libdir . '/filelib.php');
 
         if ($this->content !== NULL) {
@@ -132,11 +131,12 @@ class block_tag_youtube extends block_base {
 
         $tagid = optional_param('id', 0, PARAM_INT);   // tag id - for backware compatibility
         $tag = optional_param('tag', '', PARAM_TAG); // tag
+        $tc = optional_param('tc', 0, PARAM_INT); // Tag collection id.
 
-        if ($tag) {
-            $tagobject = tag_get('name', $tag);
-        } else if ($tagid) {
-            $tagobject = tag_get('id', $tagid);
+        if ($tagid) {
+            $tagobject = core_tag_tag::get($tagid);
+        } else if ($tag) {
+            $tagobject = core_tag_tag::get_by_name($tc, $tag);
         }
 
         if (empty($tagobject)) {
@@ -172,11 +172,12 @@ class block_tag_youtube extends block_base {
 
         $tagid = optional_param('id', 0, PARAM_INT);   // tag id - for backware compatibility
         $tag = optional_param('tag', '', PARAM_TAG); // tag
+        $tc = optional_param('tc', 0, PARAM_INT); // Tag collection id.
 
-        if ($tag) {
-            $tagobject = tag_get('name', $tag);
-        } else if ($tagid) {
-            $tagobject = tag_get('id', $tagid);
+        if ($tagid) {
+            $tagobject = core_tag_tag::get($tagid);
+        } else if ($tag) {
+            $tagobject = core_tag_tag::get_by_name($tc, $tag);
         }
 
         if (empty($tagobject)) {