Bernie Sanders's Facebook page, the image will be shown to fans of MoveOn AND fans of the Bernie Sanders.
How To Tag Pages
Tagging another organization's page is easy. Add an "@" sign, and start typing the name of the page. When the page you want appears, click on its name to tag it.
If your allies don't show up immediately, try adding more characters or "liking" that page with your personal profile.
Where To Tag
This feature can expand your page's reach, but don't start tagging other pages indiscriminately. Facebook will modify their algorithms to prevent abuse, and your page could be penalized for constantly tagging Beyoncé in every post.
Tag your allies where it's appropriate. For example, use a tag if you're promoting an awesome action from another organization, and be sure to tag if you're posting another group's art.