Twitter has been on quite a tear over the past several months, deleting fake accounts as they pop up. However, the game of cat and mouse just took a whole new turn.

Check out the image below:

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Notice something? Two of the last three of the “favorited” tweets came from spammers. Here are their profiles:

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Legit photos, a profile and then spam tweets. None are legitimate people, but all are systematically trying to fool Twitter into thinking they’re real people.

It’s a great reminder for brands on Twitter to read profiles before they follow someone back. Even in the event that there is a legitimate-looking bio and tweets, it may just mean they’re not spamming you YET. Here’s a tip: If there’s a URL associated with the account (typically a URL), be sure to add a “+” symbol to the end of it. Check out this one:

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The URL takes you to a site that is clearly spam, and while their traffic driving tactic may not fool you it has fooled 11 people:

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The bottom line? It’s time to start getting selective when following someone, and at the very least it may be time to clean up your Twitter stream.