The fiscal sponsor must be a 501(c)(3) organization as recognized by the IRS. The fiscal sponsor cannot be an organization whose tax-exempt status is pending. The sponsored project must be able to qualify for exemption under section 501(c)(3), even if the project has no intention of ever applying for it.
Pressing the Ignore button on the listed invitation on the LinkedIn site is effectively a soft rejection. The message then moves to your Archived folder. You can later choose to open the message again and accept the request.
Search Results. If someone has blocked you, rather than simply discontinued your friendship, his name will not show up in your account's search results. Try typing the person's name in the search field at the top of your Facebook home page. If you don't find that person, you may have been blocked.