(Internet slang) On the video-sharing service YouTube, the practice of subscribing to a person's channel in exchange for said person mutually subscribing back to one's channel, often with the goal of artificially inflating one's subscriber count.
Similar to those who subscribe to everyone, secretly hoping those users will subscribe back, we have the Sub4Sub users. Sub4Sub users blatantly tell you they will subscribe to you if you subscribe to them.
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