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Summary: Not sure there is much of a security impact to this, more of a best practice, but the domain mobileapplinking.com, which is registered to Twitter Inc. is vulnerable to takeover using github pages.
Description: The domain mobileapplinking.com is owned and registered by Twitter.com, as can be seen through the WHOIS data attached to this report. However, the DNS for the site links to a non-existent Github pages site. This left it open for takeover through Github Pages. The site is currently registered under my github pages account, as can be seen at mobileapplinking.com/takeover
(Add details for how we can reproduce the issue)
If this site was defaced and used to transmit illegal or inflammatory things, and it was found that Twitter owned the domain, it could negatively effect the Twitter brand.