Yes, I did invest in Yelp as I was so impressed with the service. For a woman traveling solo, it was invaluable.
Here is why I like yelp.com: it is easy to use, nothing technical, nothing complicated. Here is how i have used it while traveling solo and did not have others to ask for advice:
For a hairdresser in Los Angeles within walking distance of where I stayed. Yelp listed several with consumer reviews of who was good at what kind of hair and how much it cost. When I arrived at the chosen salon, there were delighted that I had found them on yelp and am sure I got special treatment as a result.
In Paris and again in London, I used yelp to find first bistros and in London gastro pubs. ( That is a pub that has good food, no longer an oxymoron). Again great finds near where I was standing on the street in Paris and where staying in London. For India but probably not for the Puskhar Camel Market , yelp might have finds also.
Now the third time away from home was harder: a restaurant with great brunch in a rural part of NY State. And there it was in Brewster: great brunch in an unassuming area of town.
So try it and let us know if yelp is useful to you when you are away. (Forgot to say 4th time, I dissed an awful car dealer on yelp. Wish I had looked at their consumer reviews first, would not have stepped foot in that dealership in the first place.) Found another one a bit further away on yelp.