I started using it when I realized that it integrated into Strava. Used to use it exclusively for ride photos, but these days its 50/50 at best. Username:
johngmartin
There is a ton of great content out there (cycling or otherwise). To give the tiniest sampling for those who don't use...
There is the pure porn:
rmdub and
bokanev.
The bloggers:
johnprolly and
kylebkelley
The framebuilders:
fireflybicycles and
tomii_cycles
The riders:
ultraromance and
jweeeks
The bike shops:
nb_log and probably your local bike shop!
Obviously the list is endless.