I don't think it was. Their Facebook post said, "Many of you prefer visiting the mountain in the morning...".
According to Merriam-Webster dictionary, many (\ ˈme-nē \) is defined as "consisting of or amounting to a large but indefinite number".
Say 100,000 people ski at Blue Mountain, and 60% prefer to visit the mountain in the morning. That equates to 60,000 people, or are large number of people; "many".
At the same time, 40,000 people prefer to ski at night. That's also "many".
Therefore, it's also correct to state, "Many of you prefer visiting the mountain in the eveni