Facebook-developer-like-button

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https://developers.facebook.com/quickstarts/1617199315199089/?platform=web
https://developers.facebook.com/apps/1617199315199089/dashboard/
https://developers.facebook.com/docs/plugins/like-button

Sample code

Custom code

<meta property="og:url"           content="http://waterheatertimer.org/Circuit-breakers.html" />
    <meta property="og:type"          content="website" />
    <meta property="og:title"         content="Circuit breakers" />
    <meta property="og:description"   content="Photos of different types of circuit breakers" />
    <meta property="og:image"         content="http://waterheatertimer.org/images/circuit-breaker-4-500.jpg" />
</head>
<body>

<div id="fb-root"></div>
<script>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.4&appId=1617199315199089";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
    <div id="fb-root"></div>
    <script>(function(d, s, id) {
      var js, fjs = d.getElementsByTagName(s)[0];
      if (d.getElementById(id)) return;
      js = d.createElement(s); js.id = id;
      js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1";
      fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));</script>

<img alt=""
src="http://waterheatertimer.org/images/Facebook-share6.jpg"
style="border: 0px solid ; width: 135px; height: 52px;">

    <div class="fb-like"
        data-href="http://waterheatertimer.org/Circuit-breakers.html"
        data-layout="standard"
        data-action="like"
        data-show-faces="true">
    </div>