Meaning
A heart colored blue. Blue tends to feel calm, steady and trustworthy, so this heart often signals loyal friendship, support and a cooler, less intense kind of affection than red.
It is a safe choice for friends, teammates and family when you want warmth without romance: “Proud of you, little brother, good luck at the interview 💙” It also appears in posts about the sea, sports teams with blue colors and awareness campaigns. A few people read blue as a sign of sadness, but that meaning usually needs context.