Most of these tools are marketed as "free to use," relying on ad revenue rather than subscription fees.
I’ll assume you want a proper feature specification for a tool named "https+viptoolses+facebook+auto+liker+exclusive" (an auto-liker extension/service). I’ll produce a concise, prescriptive feature spec including purpose, core functions, risks/constraints, privacy/security notes, and acceptance criteria. https+viptoolses+facebook+auto+liker+exclusive