If the website www.videosplash.net or any other websites keep prompting you to access your Facebook info or post on your behalf even when you choose to decline, please report them to Facebook. These websites are violating Facebook policies when they keep asking you to access your Facebook information even after you have clicked the "Cancel" button.
The website www.videosplash.net prompting you for your Facebook information:

Now, although the prompt has an image of "YouTube", it is not the popular video sharing website YouTube.com that is requesting your Facebook information, instead, it is the website www.videosplash.net. This is a very deceptive trick and websites that use tricks like these should not be trusted.
Here is a Facebook post with a link to ww.videosplash.net

Best one punch knockout ever
I do not recommend allowing this website or others like it to access to your Facebook information.
Facebook recommend that you do the following:
- I'm stuck in an app that keeps asking to access my info or post on my behalf, and I can't dismiss the message.
- If an app asks to access your info or post on your behalf and won't allow you to decline or click Cancel, it isn't following our policies.
- Please report the app (click here) if it continues to ask for your info. We appreciate your patience, and thanks for helping us enforce our policies
This Facebook information is located at: https://www.facebook.com/help/258359927634494.
If you have already given this website access to your Facebook information, you can remove it by clicking here.