I made this app for YouthForBlood's “Blood Group Tail” campaign. It is a campaign to aware people about “blood group” through Social networking sites. Educating and encouraging people to donate blood has been a matter of serious concern for us. We still have a condition where friends within our circle are still unaware about their blood group.
The app is live at www.bgt.youthforblood.org
I also made a tutorial video on how to use this app. Watch it on YouTube here