The optional WITH FEED NewsFeed clause allows you to filter all search results that are associated with your news feed. This clause can be used in API version 19.0 or later. To use this clause, collaboration must be enabled for your organization.
The syntax is:
WITH FEED NewsFeed
When using WITH FEED NewsFeed, you must also include the RETURNING clause, specifying only FeedPost, FeedComment, or both.
For example:
FIND {acme} RETURNING FeedPost, FeedComment
WITH FEED NewsFeed