Sure you can, and that behaviour is rather mainstream by now, but it wasn&#x27;t long ago it was considered very egoistical.<p>Every time you install an app and you agree to upload your contact list to someone? That data was not yours to share.<p>Every time you put a little tracking script on your web page in exchange for traffic graphs it is your customers data you sell. Not your.<p>Every time you email me everything I write ends up indexed under my email address, to be sold to another company and cross referenced. I didn&#x27;t agree to this.<p>That like button you put up that reports all your visitors behaviours? Not your data.