Update advice

Author: marcprux

index.md

@@ -129,6 +129,7 @@ Complaints are especially impactful when they are authored by a citizen of that
 ## Other
 - Provide feedback directly to Google using their [Android developer verification requirements survey](https://docs.google.com/forms/d/e/1FAIpQLSfN3UQeNspQsZCO2ITkdzMxv81rJDEGGjO-UIDDY28Rz_GEVA/viewform?pli=1).
 - Make your voice heard on social media and with blog posts, and link to https://keepandroidopen.org
+- Combat astroturfing: when you encounter suspect posts on community forums and social media in support of the policy (“Well, actually…”), challenge them and do not be shy.
 - Help this project out by [editing this page](https://github.com/keepandroidopen/keepandroidopen.github.io/blob/main/index.md) with more useful information.
 
 ## References