NEW YORK — Even people who said they'd already done their shopping online came out for Black Friday to spend time with family members or just for the fun of looking.But it's those very shoppers retailers are trying to keep as loyal customers, working to improve their own online sites and letting people pick up purchases in the store as the retailers try to fend off the Amazon juggernaut. Even as retailers kick off the shopping season earlier each year, the day after Thanksgiving is still one of the busiest sales days of the year. It's also becoming an American export to other countries.Shoppers were on the hunt for deals and were at the stores for entertainment Friday.