Wheriz: Where are you in Web 2.0

I think it is a worthwhile site to be for groups of people, I'd like to see spanish mathematicians there, as this would simplify the "will you be at **** next month?"
Adding a stay is as simple as follows:

You start with an empty future, add something to it. I'll add a "usual" stay, in my hometown for the next let's say, five years. You can edit later, and overwrite, as you'll see.
You type here where you want to go, and Google will find it, almost for sure (it had some problems when I went to Denmark... because I was in an almost unknown place).
An overlap is detected, and I have the options depicted. Overwrite is what I want, thus I'll be in Badalona today, tomorrow in Segovia and in Badalona when I'm back.
Now all my wheriz contacts (and people who look for me there, or in my Facebook account through wheriz's facebook app) will now next week I'm at Segovia.
You can also check wheriz's twitter.
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Now all my wheriz contacts (and people who look for me there, or in my Facebook account through wheriz's facebook app) will now next week I'm at Segovia.
You can also check wheriz's twitter.