result.latestPosts, on desktop and mobile, with no flag and at no extra cost. The block can be in the result column or in a section of the entity panel, open or closed. latestPosts is omitted when the SERP has no Latest posts block.

Latest posts in Google Search
result.knowledgeGraph.socialPosts and result.latestPosts.
Latest posts structure
Post
position, platform, text, link and date are always present. handle, engagement and redirectLink are included only when Google shows them.
Response example
A response toeminem, on desktop: