I was collecting meta tags for my client's project (NGO website, will share soon), then list became too long and I decided to remove the useless meta tags which aren't helpful in seo. So here it is, it's completely fine to remove these (if you are not so paranoid about seo).

<link rel="shortlink" type="text/html" href="http://flic.kr/p/6XuLyD">
<link rel="profile" href="https://gmpg.org/xfn/11">
<meta name=audience content=All />
<meta name=distribution content="Global" />
<meta name="linkage" content="https://rexwebmedia.web.app"/>
<meta name="revisit-after" content="7 days" />
<meta name="robots" content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1" />
<meta property="article:author" content="https://www.facebook.com/rexwebmedia" />
<meta property="article:publisher" content="https://www.facebook.com/rexwebmedia/" />
<meta name="host" content="rexwebmedia.web.app"/>
<meta name="host-admin" content="deep"/>
<meta name="identifier-URL" content="https://rexwebmedia.web.app"/>
<meta name="subject" content="Services Offered: Digital Marketing & SEO Agency | Software Company | Website Design | Mobile App (Android/ iOS) Development | Web Hosting | Bulk SMS, Email"/>
<meta name="web_author" content="rexwebmedia"/>

That's it now, as I am currently looking for more organic ways search engine optimisation so i will be updating this list.

See you later or maybe on twitter. 😉