What does the underlined phrase "keeping tabs on" in paragraph 3 probably mean?

第三段中划线短语 “keep tabs on” 可能是什么意思？

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One nonprofit organization, which monitors the treatment of animals in filmed entertainment, is keeping tabs on more than 2,000 productions this year.

一个监管娱乐节目拍摄中动物待遇的非营利组织今年正在密切关注2000多部作品。

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Juventus are keeping tabs on ac Milan full-back Luca Antonini despite his desire to remain at San Siro.

尤文图斯一直在关注米兰的后卫卢卡·安东尼尼，尽管他希望留在圣西罗。

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Keeping tabs on deals done in distant countries by hard-up or inexperienced universities can be tricky.

ECONOMIST: Universities

This is where I sit, keeping tabs on the torrent of information that enters my stream.

FORBES: Swimming With Information Sharks (And Snooki)

This Twitter tracker will be keeping tabs on which VMA moments are going off on Twitter.

FORBES: VMAs: How MTV Will Unleash Big Data To Entertain Us