Senior Nathan Hu who posts on Tumblr at least once every day was simply trying to write his daily post when suddenly, the post disappeared, and an apology message from Tumblr was displayed. Along with some of his friends, he then proceeded to post a few complaint messages on his Facebook.

The site outage created much disappointment among dedicated users of Tumblr like junior Devi Kovi who uses the service multiple times a day. She first discovered that Tumblr was down after failing to submit a post that her friends really wanted to see, leading Kovi to return to the site a few times every hour to see if it was operational yet.

“If you’re going to have a lot of users…it’s your responsibility to keep it up,’” Kovi said.

After the site went back up, the service issued an apology to its users, mentioning that the interruption of service was caused by maintenance problems and that such errors are “unacceptable” for Tumblr. The apology also refuted claims that the online community of anonymous activists, 4chan, took down the site by means of a “denial of service” attack. In this kind of attack, websites are flooded with requests from thousands of computers, causing servers to overload and fail to function.