Great question! We do still monitor usage time, but we also monitor any profiles that are visited within both the Instagram app and Tumblr app. We also monitor any links that direct them to other sites within any hidden browsers in Instagram and Tumblr.
The one thing we are unable to see are the timelines/newsfeeds for Tumblr and Instagram. The timelines/newsfeeds are the main pages of both these apps, with the most recent posts by profiles that are being followed by the user. Since it's just a scrolling page there are no new URLs to put on the report until they click into a profile or link.
If you have any further questions about what our Android app monitors feel free to give our Customer Support a call at 877.479.1119