The Windows Phone app, which has gone free next as myAppFree app of the day is Phototag. It allows you to document your captured moments on the photo itself and instantly sharing them with your friends.
Phototag Features:
• 6 overlay themes: Place, Weather, Food, Baby, Speedometer, and Date+Time. More to come!
• Front and back camera support
• Option to use Exif timestamp and location data, if available
• Historical weather overlay support (subject to weather data availability)
• 20+ gorgeous photo filter effects
• Instantly share to Facebook, Twitter, Flickr, Tumblr, and VK
• Native sharing to social networks is also supported
• 6tag integration for uploading to Instagram
• Photos Hub and Lens integration
