I know the Activity API has before/after and paging. However for those really wanting to build a cached feed and then have a 'pull to refresh' kind of view, knowing the timestamp of when the activity was last changed (which could have been uploaded[new] or changed) would be more helpful.
I want to issue a request for activities.
Then later I want to say "get me all activities that have changed since [last timestamp I asked for activities]"
The before/after isn't exactly what I want because that is based on start date of the actual activity. Heck I have friends that upload activities 2 months after the event...I just want to know WHEN the activity was changed.
-th