For one of our app projects finding where are friends or fellow twetters are jamming out at in Austin could help a user locate a concert they want to go to. One way could be using dots to show each particular user in the area of the concert they are in. Another could be through using different colors to show the majority of users in one place, kind of like infrared heat.
I believe web scraping through Twitter could be a great opportunity to find where the concert goers are at. Datasift could be a great program we can utilize. From the readings it seems Google also has some great and simple tools we can use to organize data.
To engage the user we could have them rate the concert continuously through. This data could help others to determine if it is worth stopping by.