I have a twitter style input that allows users to type in hashtags with their post. The user can then filter the news feed by these hashtags to see only posts that contain them. How can I communicate to the user that they can use the same input for both posting and filtering, as well as not confusing them with unintentional filtering.
At the moment my running idea is to have the input set up to make a new post, and as the user types in a hashtag a search button would appear beside the post button. This is short form content, so I don't feel like the user would fear losing their post by clicking search (they won't in any case) but since it hides the search button before it is clickable the user won't know how to access it.