SMS it..
With so many local sites coming up, and trying to sync up with mobile phones and stuff esp. the local search sites .. A user can just send an address/info about some place via SMS. Even though its convenient, its kinda stupid at the same time. Most of these sites enable SMS feature without even a login account. I as some random user can always spam someone *anonymously* by just typing a mobile number. Thankfully, they don't allow the user to edit/add any message.
Let me know what you guys think :)