Look into and check if models in GMG are in line with OStatus
objects and activity entries. Create necessary models.

This will probably need discussion on what to include in the first
around and what to exclude. First round should at least contain
Image and Comment objects, as well as the post verb.

Add signal functions or something similar to create entries when a
user posts a new Image or a Comment or access activity information
by some other means (depends on the implementation). Keep in mind
that GMG must be able to support other verbs (e.g. favorite,
follow) so reading directly from MediaEntry model is probably not
the optimal solution.

Create a pure atom feed from user activity entry feeds, i.e. do not
show specific OStatus/Activity Stream elements. Title, summary,
published, id and author is enough to work with to begin with.

Comply to the Atom standard and create and extensible feed
framework which is ready for the Activity Stream extensions.

Make the feed discoverable from the user profile page.

Incorporate activity stream namespace and represent objects and
verbs in the stream according to the Activity Stream base schema.
If Atom feed and the feed framework, as well as the model structure
were created with extensions in mind, this shouldn't be difficult.