I have recently had a rash of sale organizers and other people in the consignment arena contact me about Facebook hijackers. You know the ones... the competing sale who posts on YOUR Facebook wall in attempt to advertise their business to your clientele and all under the guise of "Good luck at your sale this week! We love your sale!" [wink, wink]. No, you don't. You are attempting to hijack their Facebook page. And if you think they are too stupid to figure that out, think again.
If you are going to put your link on another businesses page, the correct procedure would be to A. obtain permission from the business owner. B. "Like" their page C. Post on your wall with a link to their wall. So, instead of posting on XYZ's business page: We love your business! You should post on your own page: Good luck XYZ (link to their page)! We love your business!
This allows you to share them with your clientele, is completely appropriate and doesn't hack anyone off causing you to quickly become blacklisted for trying to steal someone else's customer base.