Not all blue heart meaning is about feelings in the “serious” sense. In fandoms and online communities, blue hearts can signal enthusiasm, affection for a creator, or support for a cause tied to a particular group.
Some communities develop their own emoji shorthand. In those cases, a blue heart can function like a membership badge—less about sympathy and more about identity.
If you want to read it accurately, look for repeated patterns: does the same account use 💙 when discussing one specific theme? Do similar posts show the same emoji alongside the same topic?