Your official blog post is inane marketing-speak that has no basis in the reality of the damage Elsevier has done and continues to do to the fabric of science publishing. Mendeley should be ashamed, and you personally should be ashamed for perpetuating this nonsense. Within a year your company will be effectively dismantled and anyone left over who actually cares about open access can start over from scratch. I wish them luck.
There have been detailed discussions about how Mendeley can integrate with parts of Elsevier like Scopus and Science Direct. I don't think they would have gone through all that effort just to bury it. I could be wrong, but I think things are changing at Elsevier and I think bringing us in is part of that.
Not only are they horribly exploitative towards the academics and librarians who by and large both write and purchase what Elsevier publishes, they also ... sponsor arms fairs! whee!
Edit: If you log in to your account and go to account details there's a "delete your account" link at the bottom. When you click the link you get a dialogue box that says this:
We're sorry you want to go, but if you must... Deleting your account will remove all of your personal data from Mendeley Web, and limit the functionality of Mendeley Desktop. Your data is still present in Mendeley Desktop so it can be archived or exported.
If your profile is visible to search engines then Mendeley may show up in relevant search results until the search engines re-index the site (this is an ongoing process but should occur within a couple of weeks.) Until this occurs, clicking on the search result link will load a Mendeley page stating that the profile cannot be found.
Good luck there in this new path!
If there are more questions, we have put together a couple questions and answers here: http://blog.mendeley.com/press-release/qa-team-mendeley-join...
Finally, if there are still lingering questions, we're more than happy to answer them here or directly with us on twitter @rvidal / @mendeley_com / @mendeleysupport And there's always email: [email protected] :)