Marketers have devised all sorts of creative ways to promote and sell their brands on Facebook. Of course, there are many marketing tactics Facebook doesn't want to see on its platform, and it created a specific set of policies to weed them out.\nDuring last week's closing keynote at the Word of Mouth Marketing Association (WOMMA) Summit in Los Angeles, Allison Hendrix, policy manager for Facebook's public policy management and communications team, gave marketers a crash course on what they can and cannot do on Facebook.\nFacebook Promotions Policy\nFacebook's promotions policy kicks in when brands ask users to enter contests or register to win something such as a sweepstakes or prize. "Where you have a call to action, you're asking the person to do something so they might get something out of it," Hendrix says. "When those factors are in play you have to adhere to our promotion guidelines. We want to make sure that you pay attention to where you're allowed to place that promotion."\nPromotions in which users register to win something can't be posted to users' personal timelines, and marketers cannot ask Facebook users to post hashtags in their timelines for chances to win. It's OK, however, to place promotions on Facebook pages and in apps (page tabs and canvas pages), according to Hendrix.\n[Related Feature: How Brands Can Convert Facebook Users Into Customers]\nFacebook's promotion policy doesn't kick in unless brands create an expectation that a behavior or action might result in a prize. "We will let you know to the extent that we think you're crossing the line," says Hendrix, adding that companies also have to adhere to local, state and national promotion laws. "The key is to not be misleading in your messaging," she says.\nFacebook Likes\n"Likes" may be the most popular metric of all on Facebook, and marketers get agitated when the rules for Likes change.\nHendrix says the company knew there would be some confusion over a recent change to its Like policy. "You're absolutely allowed to encourage people to connect to your page," but users cannot be rewarded for clicking on a like button, she says.\nHere's where it gets confusing. "The rules do not extend into the Like action link," according to Hendrix. That means brands can still incentivize users to like posts because the Like button isn't used, just a link.\u00a0\n[Related News Analysis: Facebook's Anonymous Rooms Could Cause IT Headaches]\nFacebook and Donations\nFacebook takes a hands-off approach to donations, unless brands create user expectations for potential prizes. It's fine if "you're just making that person feel good, you're not giving them anything," Hendrix says to explain how Facebook makes the distinction.\n"You're allowed to have people engage and share and communicate about your brand and attach that communication and engagement to donations," she says.\nFacebook Sharing\n\u00a0Hendrix clarified Facebook's policy on sharing and specified that companies can never post on a user's behalf.\u00a0\nWhen brands ask for a users' permission to share on their timelines it's just a technical grant to allow those users to share from a brand's post, Hendrix says. "That doesn't mean that [the brand] just gets to start dropping posts on my wall\u2026 It's about consent."\nFacebook also discourages brands from asking users to take action and use the brand's voice on their behalf. "Just let people share and communicate about your brand because they're excited about it," she says.\nMarketers can use incentives to motivate users to login to apps, check-in to venues or comment on brand pages, but not on their personal timelines. "We're just trying to maintain true authentic communication from the person," says Hendrix.\n[Related News Analysis: Facebook, LinkedIn and Twitter Earnings Tell Very Different Tales]\nFinally, one of the biggest Facebook marketing no-nos: tagging users in posts for promotions. Hendrix says she's been reluctant to formalize a policy on the practice because the outcome is so clearly spam.\nUltimately, it's all about the user. "You have to put the user experience first and at the forefront," Hendrix says, otherwise you're doing a disservice to the brand, Facebook and its users.