diff --git a/source/_data/knowledge.json b/source/_data/knowledge.json
index f51c012..65c407c 100644
--- a/source/_data/knowledge.json
+++ b/source/_data/knowledge.json
@@ -7,15 +7,19 @@
             "url": "https://fediverse.party/en/post/fediverse-saves-from-pickup-artists-and-7-more-reasons-to-join"
           },
           {
-            "title": "The Centralization of Power on the Internet",
+            "title": "The centralization of power on the Internet",
             "url": "https://blog.joinmastodon.org/2018/02/the-centralization-of-power-on-the-internet "
           },
+          {
+            "title": "Decentralized social networks in 2018: diaspora, Friendica, Hubzilla",
+            "url": "https://www.lazyteddy.eu/index.php/2018/11/17/an-overview-decentralized-social-networking"
+          },
           {
             "title": "Distributed social networking in 2017: a review",
             "url": "https://iwrotethislive.blogspot.ru/2017/11/distributed-social-networking-in-2017.html"
           },
           {
-            "title": "How to Block the NSA From Your Friends List",
+            "title": "How to Block the NSA from your friends list",
             "url": "http://www.slate.com/blogs/future_tense/2013/06/17/identi_ca_diaspora_and_friendica_are_more_secure_alternatives_to_facebook.html"
           }
         ]