Subscribe to site on Youtube or Facebook = Reward

Is there a way using PHP or Javascript to detect whether someone subscribes to your YouTube channel or Facebook page?  I basically want to create a button that users of my site can click to subscribe to me on YouTube or Facebook and than I want to reward them for doing so.
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There's no event to track the click on the button :

You can found on the same page the following :
Conditions of use

By using the YouTube Subscribe Button, you agree to the YouTube API Terms of Service and all other relevant API documentation, including without limitation the Monetization Guidelines and Branding Guidelines. The YouTube Subscribe Button does not allow you to use the YouTube brand in any way not expressly authorized by the API Terms of Service and API documentation.

For clarity:

You may not offer or promote prizes or rewards of any kind in exchange for clicking on a YouTube Subscribe button.

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RobOwner (Aidellio)Commented:
I've requested that this question be closed as follows:

Accepted answer: 500 points for leakim971's comment #a39468971

for the following reason:

This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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