An unknown number of Twitter accounts were suspended yesterday due to "human error", says the microblogging site, after earlier blaming spam attacks.
"Earlier today, we accidentally suspended a number of accounts. We regret the human error that led to these mistaken suspensions," Twitter said in a blog posting.
Twitter initially blamed a "spam cloud" indicating a massive spam attack similar to previous attacks by organisations that have flooded the microblogging service with spam messages.
"A lot of innocent-bystander accounts get massacred in the process, which they then have to restore afterwards," said Tweet scheduling service Tweetlater.
Twitter said some of the accounts suspended were using the third-party site Tweetlater. "However, Tweetlater is not to blame for these suspensions nor is it in violation of our terms," Twitter said.