Agree. Keeping the rights, having full control on publishing/unpublishing your stuff, and non-exclusivity are the three most important requirements when using

Agree. Keeping the rights, having full control on publishing/unpublishing your stuff, and non-exclusivity are the three most important requirements when using these kind of services. Any of these services (with the requirements stated above) is just another outlet - another opportunity to reach more people - and there's no reason not to join.