Cacher is the code snippet organizer for pro developers

<meta property="og:title" content="European Travel Destinations">
<meta property="og:description" content="Offering tour packages for individuals or groups.">
<meta property="og:image" content="http://euro-travel-example.com/thumbnail.jpg">
<meta property="og:url" content="http://euro-travel-example.com/index.htm"><!-- Must match the data-href from the button -->
<meta property="fb:app_id" content="your_app_id" />
<meta name="og:site_name" content="European Travel, Inc.">

<meta name="twitter:title" content="European Travel Destinations ">
<meta name="twitter:description" content=" Offering tour packages for individuals or groups.">
<meta name="twitter:image" content=" http://euro-travel-example.com/thumbnail.jpg">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@website-username">
<meta name="twitter:image:alt" content="Alt text for image">

FACEBOOK

Title:
The title, headline or name of the object.

Description:
A short description or summary of the object. [Between 2 and 4 sentences.]

Image:
The URL of the image for your object. It should be at least 600x315 pixels, but 1200x630 or larger is preferred (up to 5MB). Stay close to a 1.91:1 aspect ratio to avoid cropping.

URL:
The canonical URL for your page. This should be the undecorated URL, without session variables, user identifying parameters, or counters.


TWITTER

Title:
A concise title for the related content. (Maximum 70 characters.)

Description:
A description that concisely summarizes the content as appropriate for presentation within a Tweet. You should not re-use the title as the description or use this field to describe the general services provided by the website. (Maximum 200 characters.)

Image:
A URL to a unique image representing the content of the page. You should not use a generic image such as your website logo, author photo, or other image that spans multiple pages. Images for this Card should be at least 280px in width, and at least 150px in height. Image must be less than 1MB in size.

Card:
https://dev.twitter.com/cards/types
summary
summary_large_image
photo
...