Deeplinking allows you to open the Official App of major Social Networks instead of the browser.
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Most users that will click on your Social Icons, will have the app installed, while they will not also be logged in the browser. So in most cases deeplinking tremendously increases the conversion rate.

If you wish to disable deeplinking and always use the web browser to open the links, you can disable deeplinking from Your Profile => Deeplinking, as shown below:

Once you click on Edit, as shown above, you'll be able to quickly choose to disable Deeplinking, as shown below: