You can save posts in Favorites to read later. This is useful for saving older posts to read later, without needing to search past posts to find them again.
Notes
Favorites does not sync functions such as the Twitter favorite function.
Saving posts in Favorites
Tap at the upper left of the screen, and tap any item under My Stream.
Tap the post you want to save from the posts of networking services or news sites. The details of the post are displayed.