diff --git a/_docs/overview/rtos/index.md b/_docs/overview/rtos/index.md
index 9293120d..2d341cad 100644
--- a/_docs/overview/rtos/index.md
+++ b/_docs/overview/rtos/index.md
@@ -50,7 +50,7 @@ In this section, we review the main features of the three RTOSes supported offic
 
 ### **FreeRTOS**
 
-FreeRTOS is distributed under the MIT license. It is know particularly for is simplicity and the extension a:FreeRTOS provided by Amazon. For micro-ROS, we make use of the POSIX extension.
+FreeRTOS is distributed under the MIT license. It is known particularly for its simplicity and the extension a:FreeRTOS provided by Amazon. For micro-ROS, we make use of the POSIX extension.
 
 <div class="rtoscontainer">
   <div class="rtositem_description">
diff --git a/scripts/cibuild b/scripts/cibuild
index f9056ca1..5a6cccdb 100755
--- a/scripts/cibuild
+++ b/scripts/cibuild
@@ -17,6 +17,7 @@ fi
 IGNORE_HREFS=${IGNORE_HREFS:+$IGNORE_HREFS,}$(ruby -e "puts %w{
   vimeo.com
   omg.org
+  twitter.com
   ${ADDITIONS}
   }.map{|h| \"/#{h}/\"}.join(\",\")"
 )