The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Jose Jacinto:
How many times did you find out your friends were just next to you? In a show, in the pub or in a commute? DropBy is a background service that allows you to be informed when a friend is nearby. A push message will give the alert and both can chat to arrange a meeting or just to say hi.You can also place and receive geo-localized messages. Broadcast your message in a simple step. Any passing user can receive the message and start a group chat. Do you love the pub you're currently in? Just drop a message and get the community involved.BATTERY CONSUMPTIONDropBy is smartly designed to update your location only when you're moving, limiting the GPS usage. However, please beare in mind that :Continued use of GPS running in the background can dramatically decrease battery life.