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    <p>Andreas, I've also been looking for an "email-to-id" ellegant solution and couldn't find one. However, as you said, screen scraping is not such a bad idea in this case, because emails are unique and you either get a single match or none. As long as Facebook don't change their search page drastically, the following will do the trick:</p> <pre class="lang-java prettyprint-override"><code>final static String USER_SEARCH_QUERY = "http://www.facebook.com/search.php?init=s:email&amp;q=%s&amp;type=users"; final static String USER_URL_PREFIX = "http://www.facebook.com/profile.php?id="; public static String emailToID(String email) { try { String html = getHTML(String.format(USER_SEARCH_QUERY, email)); if (html != null) { int i = html.indexOf(USER_URL_PREFIX) + USER_URL_PREFIX.length(); if (i &gt; 0) { StringBuilder sb = new StringBuilder(); char c; while (Character.isDigit(c = html.charAt(i++))) sb.append(c); if (sb.length() &gt; 0) return sb.toString(); } } } catch (Exception e) { e.printStackTrace(); } return null; } private static String getHTML(String htmlUrl) throws MalformedURLException, IOException { StringBuilder response = new StringBuilder(); URL url = new URL(htmlUrl); HttpURLConnection httpConn = (HttpURLConnection) url.openConnection(); httpConn.setRequestMethod("GET"); if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) { BufferedReader input = new BufferedReader(new InputStreamReader(httpConn.getInputStream()), 8192); String strLine = null; while ((strLine = input.readLine()) != null) response.append(strLine); input.close(); } return (response.length() == 0) ? null : response.toString(); } </code></pre>
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    1. POFind Facebook user (url to profile page) by known email address
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    1. USsakibmoon
    1. USZach-M
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    1. COScreen scraping is a violation of the Facebook TOS.
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      1. USDan Fabulich
    2. COExactly. This is akin to comparing women's faces with barn animals.
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      1. USRyan McGeary
 

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