Other fitness/food sites/apps?

I'm new here.
I'm using this site in combination with Fleetly (basically a social media fitness site that has given me ongoing fitness goals), RunKeeper (I started running in February) and FitLinxx (which is connected with the weight machines at my YMCA but also keeps track of cardio activity). In all, it is a lot of work to keep track of everything, though I try to link the sites as much as possible.
MyFitnessPal, I think, is the final piece of the puzzle. My goal is to lose 35 pounds while at the same time building muscle mass and to build/strengthen my core.
What other sites/apps are people using?