diff --git a/app/models/trending_tags.rb b/app/models/trending_tags.rb
index c69f6d3c33..94787679f5 100644
--- a/app/models/trending_tags.rb
+++ b/app/models/trending_tags.rb
@@ -4,7 +4,7 @@ class TrendingTags
   KEY                  = 'trending_tags'
   EXPIRE_HISTORY_AFTER = 7.days.seconds
   EXPIRE_TRENDS_AFTER  = 1.day.seconds
-  THRESHOLD            = 5
+  THRESHOLD            = 3
   LIMIT                = 10
   REVIEW_THRESHOLD     = 3
   MAX_SCORE_COOLDOWN   = 2.days.freeze
@@ -38,7 +38,7 @@ class TrendingTags
         max_score = 0 if max_time.nil? || max_time < (at_time - MAX_SCORE_COOLDOWN)
 
         score = begin
-          if expected > observed || observed < THRESHOLD
+          if expected > observed #|| observed < THRESHOLD
             0
           else
             ((observed - expected)**2) / expected
diff --git a/app/services/fetch_link_card_service.rb b/app/services/fetch_link_card_service.rb
index f0b1169db8..76e42795b9 100644
--- a/app/services/fetch_link_card_service.rb
+++ b/app/services/fetch_link_card_service.rb
@@ -40,7 +40,7 @@ class FetchLinkCardService < BaseService
     @card ||= PreviewCard.new(url: @url)
 
     Request.new(:get, @url).perform do |res|
-      if res.code == 200 && res.mime_type == 'text/html'
+		if res.code == 200 && res.mime_type.end_with?('text/html')
         @html = res.body_with_limit
         @html_charset = res.charset
       else
diff --git a/public/auto_comp_email.js b/public/auto_comp_email.js
index aaddd3d04d..ebf3ae2559 100644
--- a/public/auto_comp_email.js
+++ b/public/auto_comp_email.js
@@ -6,6 +6,7 @@ em.addEventListener("blur", function( event ) {
 	if(ap.style.display != 'none' && em.value) {
 		em.value+=ap.innerText;
 		ap.style.display = 'none';
+		alert('注意:清华邮箱收取外部邮件会有至多十分钟的延迟，完成注册后请稍后再查收邮件')
 	}
 });