Required for Communities and People. Optional for Posts, Media and Comments: you can search with other filters instead (Subreddits, Authors, Title contains, ...), or read feeds. In direct mode (Reddit page URLs / Subreddit feeds) it only keeps the posts whose title or text contains the keyword (several words must all appear; use double quotes for an exact phrase). Words or phrases to search for. Posts, Media and Comments: the keyword is sent to Reddit as plain text (q=). A keyword can be searched in two ways. (1) All words, any order: type the words without quotes, for example portable grill. Reddit returns posts that contain all the words, anywhere in the title or text and in any order (in a test of 100 posts, 91 contained both words and 34 had them side by side). (2) Exact phrase: put the phrase in double quotes and type the quotes as part of the keyword, for example "portable grill". Reddit then returns posts where the words appear together in that order (in the same test, 98 of 100). Each item in the list is a separate search and the results are added together, so ["portable grill", "camping stove"] finds posts about either one; it does not require both in the same post. Comments: the keyword finds the posts whose comments are collected. For Posts, Media and Comments, if you fill in "Title contains" or "Post text contains" under Advanced filters, those replace the keyword search: the keywords are not used in the query (not in direct mode, where all filters are applied together). Communities and People: the keyword is sent to Reddit as plain text. Communities: Reddit matches the keyword, ignoring upper/lower case, against the subreddit name, title, short description and sidebar description. Names that contain the keyword inside a longer word can match too (for example "camping" finds r/OhioCamping). Results arrive in Reddit's own order (not sorted by size), and the first page can also contain large, loosely related communities whose returned fields do not contain the keyword; this comes from Reddit's search, not from a filter of this Actor. Double quotes make the match much stricter (in a test with outdoor camping, the first page had 100 communities without quotes and 9 with quotes). People: the keyword is matched mainly against the public profile description (for example outdoor camping finds a profile that says "I film outdoor fishing and camping trips"). Double quotes make the match stricter and return fewer results (in the same test 19 people without quotes and 3 with quotes). A user name that contains the keyword inside one longer word (for example u/Outdoorcampingshop) is usually NOT found. The People results of this Actor come from Reddit's search API and can differ from the Profiles tab on reddit.com, which uses a different search; this is a limit of Reddit's API, not a filter of this Actor.