So one of the most annoying pet peeves on facebook for me as a page manager (in this case almost always because of Wikipedia) is that it defaults to liking and commenting AS Wikipedia when the page is mentioned in someone's post (which, as you can imagine, is relatively frequently when half+ of your friends are Wikipedians). This has caused multiple occasions where I've accidentally liked a comment or post as Wikipedia and had to revert myself (luckily I've never accidentally commented as Wikipedia, the comment box ends up with a little globe next to it instead of my picture so I notice, the comment like button does not).