Is there a way to actually make a Wikipedia tab on your Facebook page?

no its only for community pages... however Facebook says that Community pages are meant to be “the best collection of shared knowledge on a topic”. When you visit a community page, the first thing you’ll see is an ‘Info’ tab that has a brief description gleaned from Wikipedia, followed by related posts that your friends and the global Facebook community have created ( it looks like Facebook is running a search query on the topic and showing the results). There’s also a tab for ‘Wikipedia’, which contains the full entry if it’s available. At launch Facebook has created over 6.5 million community pages, around topics like  Cooking ,  Cycling , and  Hiking . Conspicuously absent are options to actually add content to the page, aside from updating your status with a relevant keyword. There’s no Wall, and there’s no way to post photos or videos. Instead, Facebook is currently inviting users to apply to add content to these pages later on (it sounds like Facebook is still fleshing out how exactly this will work). Facebook intends to eventually allow users to upload their photos to the page.  At this point, though, it seems like Communities have a long way to go before they feel anything like an actual community. Still, it’s clear that these could have a lot of potential in the future.