The search bar provides a filtered search of the subreddit. The queries can be structured as follows: 'subreddit', 'r/subreddit'. No nsfw results will be parsed.
Some subreddits do not allow images to be posted as thumbnails, and some posts (such as self posts) do not have thumbnail images. The placeholder is placed when any of these are the case.
The reddit api, which we pull all relevant data from, updates about every 30 seconds. The page will not refresh automatically so any new results must be re-entered into the search results or simply searched again.