I since last night have seen about 50 people banned for 30 days from facebook for liking pages and facebook unlikes any page they had liked in the last 30 days. This is a huge problem for people that enter most any kind of contest or sweepstakes. From what I am reading no set pattern exisits for who is being punished.
Some people had 5000+likes some people a 2000 or less. Also one lady logged into find it after coming home from vacation and not being on line for a few days. Another had only liked 4 pages that day.
This is the warning that is being shown:
You've been temporarily blocked from liking Pages on Facebook because of the amount and type of Pages you've liked recently. We've also cleared all of your likes from the past 30 days.
You'll be able to like Pages again in 30 days.
Remember that you should only like Pages you're genuinely interested in. Visit the Facebook Community Standards to learn more about our policies.