Walmart's website had major delays on Thursday, upsetting customers who were hoping to score deep discounts.
Walmart for the first time this year offered its Black Friday deals online.
The deals went live at 12:01 a.m. on Thanksgiving.
But many customers said they weren't able to shop for the items they wanted because of website delays.
Hundreds of customers wrote about their experiences on Walmart's Facebook page.
Walmart responded to many of the complaints with an apology, saying the website was overwhelmed by a surge in traffic.