Yahoo has bought a new social network for mobile users called Koprol. This network allows people to make friends, share photos, and find nearby locations all from their phone. When accessing Koprol from your mobile device, you can see what friends are doing and where/when they are hanging out. You can find neighborhood restaurants, stores and other businesses, then rate your favorites for all to see. There is also a discussion feature where you can start and invite friends into conversations. If you are wondering why you have not heard of this community-based information network, it’s because…