Each Upsource user (yourself included) has a public profile with all the information about his activity across the projects:
a graph of the user's commit activity during the last year
the user's recent activity, recorded in a news feed (events and discussions)
projects the user contributes to
the user's review activity
To open a profile of the user, click on that user's name anywhere in Upsource. You can access your own profile the same way, or click your userpic in the top-right corner and select Profile.
Your profile page can serve you as your homepage. You can open your commits, check and comment the changes, create issues and participate in reviews.