Yes, that will post a photo to an album (created especially for the app posting it, I believe), which will likely be reflected in the user's timeline. However, there's also the notion of being able to "attach" an image to a status update, which is not yet directly supported. This is the subject of https://jira.springsource.org/browse/SOCIALFB-30, https://jira.springsource.org/browse/SOCIALFB-31, and https://jira.springsource.org/browse/SOCIALFB-54 (note that I'll probably do some consolidation of those issues soon, as they are essentially describing the same thing).
In the meantime, if that's the kind of image post you want and if you're familiar with how to construct the request to post requests to the Facebook API, then you can always do Facebook.getRestOperations() and then use it to do the job at a lower-level.
Spring Social Project Lead