と同様のハッシュタグ #blue
ハッシュタグを投稿に入れるか、投稿の下の最初のコメントとして。
#blue #bluesky #blueeyes #blueskies #bluebells #blues #blueberries #bluehair #bluehour #blueberry #britishblue #mondayblues #bluedress #bluecollar #blueberryme #blueforest #bluebell #skyblue #bluemerle #bluepoint #alltheoceanblues #russianblue #blueskys #bluewater #thinblueline #bluemargot #chimayblue #bluemonday #bluelight #bluejeans