I just added my favorite new relatively unimportant feature to my website!
I added my Swarm checkins to my website a few weeks ago, which has been super fun. One thing I always thought was missing from Swarm was knowing whether a friend was still at a venue they checked in to. Since I have checkins on my own website, I can do that now!
So now, when you're viewing a checkin on my site, if I am still at that location, you will see a pulsing blue dot next to the venue name!
This works because my phone always tracks my GPS location and reports it to my website already. My website compares my last location with the last checkin, and if I'm still nearby, will show the dot!