* from - Use "from:nickname" or "from:nickname@domain.tld" to search for posts from a specific author.
* to - Use "from:nickname" or "from:nickname@domain.tld" to search for posts with the given contact as receiver.
-* group - Use "from:nickname" or "from:nickname@domain.tld" to search for group post of the given group.
+* group - Use "group:nickname" or "group:nickname@domain.tld" to search for group post of the given group.
+* application - Use "application:nickname" or "application:nickname@domain.tld" to search for posts that had been reshared by the given relay application.
* server - Use "server:hostname" to search for posts from a specific server. In the case of group postings, the search text contains both the hostname of the group server and the author's hostname.
* source - The ActivityPub type of the post source. Use this for example to include or exclude group posts or posts from services (aka bots).
* source:person - The post is created by a regular user account.