Usually after you came out with an idea, how do you find out if there're already companies executing the same idea? Is there a better way than just Googling for it?
My first company actually had a company that hired me to do some of their development work (it was on Open Source software, so I would get the benefits, as well...they were just paying me to do something I was going to do anyway). They had several million in VC money. They also hired my current co-founder to do UI work and some other stuff (he did contract work for me on a regular basis back then). Clearly they'd read all about what I was doing, since I was never too shy about how I was building my products and my company, and decided to spend their way into the market in direct competition with me. I let them (though I didn't let them use my name, or my company name, in any way to imply endorsement or involvement in their products). They were out of my market in less than a year, and completely dead within 24 months.
What I'm saying is that competition is rarely as scary as they seem, so don't obsess over it too much. It can make you give up on a good idea and something you're enthusiastic about before you really even know anything.
"better than $thing"
"like $thing"
"same as $thing"
If you'd expect Google to be a main channel - then any serious (established) competitor should be represented there.