Click +1 to publicly give something your stamp of approval. Your +1's can help friends, contacts, and others on the web find the best stuff when they search.
Here is a way to add Google +1 to your phpBB forum.
Open: styles/prosilver/template/overall_header.html
Find:
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</head>
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<script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>
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<div class="postbody">
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<g:plusone size="small"></g:plusone>