Trakt.tv started as a side project when @rudf0rd, @jimmydouglas and I wanted Last.fm-like scrobbling functionality for XBMC (now Kodi). Automatic tracking of what we watched and collected made scaling a media collection easier and a lot more fun. Little did we know that it would turn into a full-time job! We have scrobblers for all major media centers and a full featured API that powers lots of mobile apps and other community projects.
Four years in, we now have over one million users, all acquired organically with no marketing budget or outside investors. We have those users to thank for making this journey possible, as the majority of our operational costs are covered by VIPs who have contributed money year after year. Thank you so much!
I have this connected to Plex. Great for syncing watch status. Great for getting a year-end "Wrapped"-like summary of what you watched. There are some third party apps/extensions to pull in data from Netflix and such.
I love Trakt for what it is, a TV Show / Movie database with an extensive API,
However, the transphobic/homophobic people in the community really ruin social side of the experience.
Trakt.tv