When you’re first starting out and trying to build your network on Twitter, seeing new people following you is both rewarding and exciting.

Keep doing the right things and those follower numbers will continue to rise. Pretty soon you’ve got hundreds, and maybe even thousands of people reading your tweets. But are they really? How many of your followers are real, and how many are bots? Or spammers? Or long-abandoned accounts?

Or, even worse… internet marketers?

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