diff --git a/app/src/main/assets/about.html b/app/src/main/assets/about.html
index 1097230..f1450d3 100644
--- a/app/src/main/assets/about.html
+++ b/app/src/main/assets/about.html
@@ -4,6 +4,8 @@
 <h3>Open Source</h3>
 <p>The source code for this application is available at <a href=" https://github.com/akaessens/NoFbEventScraper">GitHub</a>.<strong><br /></strong></p>
 <p>If you encounter an issue, please report it to me anonymously at the <a href="https://gitreports.com/issue/akaessens/NoFbEventScraper">Bugtracker</a> or directly at <a href="https://github.com/akaessens/NoFbEventScraper/issues">GitHub</a>.</p>
+<h3>Legal</h3>
+<p>This application is intended for saving single, publicly available events into a personal calendar. Do not use it to automatically collect data and comply with facebook's <a href="http://www.facebook.com/apps/site_scraping_tos_terms.php">Automated Data Collection Terms</a>.</p>
 <h3>Donations</h3>
 <p>I develop this application in my free time. If you like it, you can donate at <a href="https://www.paypal.me/andreaskaessens">PayPal</a>.</p>
 <p><a title="PayPal" href="https://www.paypal.me/andreaskaessens"><img src="https://www.paypalobjects.com/webstatic/de_DE/i/de-pp-logo-100px.png" /></a></p>
\ No newline at end of file
diff --git a/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java b/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java
index f39a6f7..2715624 100644
--- a/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java
+++ b/app/src/main/java/com/akdev/nofbeventscraper/FbScraper.java
@@ -192,8 +192,13 @@ public class FbScraper extends AsyncTask<Void, Void, Void> {
 
         try {
             String url = fixURI(input_url);
-            // useragent needed with Jsoup > 1.12
-            Document document = Jsoup.connect(url).userAgent("Mozilla").get();
+            // use correct system user agent because of facebook ToS
+            String user_agent = System.getProperty("http.agent");
+            Document document = Jsoup.connect(url).userAgent(user_agent).get();
+
+            if (document == null) {
+                throw new IOException();
+            }
             String json = document
                     .select("script[type = application/ld+json]")
                     .first().data();
@@ -219,6 +224,9 @@ public class FbScraper extends AsyncTask<Void, Void, Void> {
         } catch (IOException e) {
             e.printStackTrace();
             this.error = "Error: Unable to connect.";
+        } catch (Exception e) {
+            e.printStackTrace();
+            this.error = "Error: Unknown Error.";
         }
 
         return null;