There are also forums or groups there, some for a particular pattern or designer, some for your state, city or area, some for discussing your favorite TV shows or movies or singers or...
I look up patterns, but also yarns, which you can see if someone is destashing any you might want and can't find. You can also look at the yarns to find projects made with different ones to see how they look knitted up - very useful for multicolored and striping yarn to give you an idea how the color changes run.
It depends on what you want to do.
sue- knitting heretic