don't query for mentioned people if mention syntax isn't present in message text.

app/models/status_message.rb

@@ -25,6 +25,7 @@ class StatusMessage < Post
   serialize :youtube_titles, Hash
 
   before_create :build_tags
+  after_create :create_mentions
 
   def text(opts = {})
     self.formatted_message(opts)
@@ -46,9 +47,9 @@ class StatusMessage < Post
   end
 
   def format_mentions(text, opts = {})
-    people = self.mentioned_people
     regex = /@\{([^;]+); ([^\}]+)\}/
     form_message = text.gsub(regex) do |matched_string|
+      people = self.mentioned_people
       person = people.detect{ |p|
         p.diaspora_handle == $~[2] unless p.nil?
       }

spec/models/status_message_spec.rb

@@ -17,11 +17,6 @@ describe StatusMessage do
   end
 
   describe '.before_create' do
-    it 'calls create_mentions' do
-      status = Factory.build(:status_message)
-      status.should_receive(:create_mentions)
-      status.save
-    end
     it 'calls build_tags' do
       status = Factory.build(:status_message)
       status.should_receive(:build_tags)
@@ -29,6 +24,14 @@ describe StatusMessage do
     end
   end
 
+  describe '.after_create' do
+    it 'calls create_mentions' do
+      status = Factory.build(:status_message)
+      status.should_receive(:create_mentions)
+      status.save
+    end
+  end
+
   describe '#diaspora_handle=' do
     it 'sets #author' do
       person = Factory.create(:person)