I started working on @osmthis twitter account which allows to post any geotagged tweets to OSM as notes. For instance, it's possible to use skitch/twitter to publish photos of cafe bills. These bills usually contain usable information as the cafe's address, phone, website etc. To use it you just need to mention @osmthis in your tweet.
- https://twitter.com/sashazykov/status/459576876395028480 -> http://www.openstreetmap.org/note/156665
- https://twitter.com/sashazykov/status/460662527945232386 -> http://www.openstreetmap.org/note/158563
This project is OpenSource. You can find it at github.