Limits alleviate some of the strain on the behind-the-scenes part of Twitter and reduce downtime and error pages. For the sake of reliability, we've placed some limits on the account actions below.
The current technical limits for accounts are:
These limits include actions from all devices, including web, mobile, phone, API, etc. API requests from all third-party applications are tracked against the hourly API limit. People who use multiple third-party applications with their account will therefore reach the API limit more quickly. For more information on this topic, please see our API Rate Limiting page.
These limits may be temporarily reduced during periods of heavy site usage. In such cases, we will post an update on the Twitter Status blog.
If you do reach a limit, we'll let you know with an error message telling you which limit you've hit. For limits that are time-based (like the direct messages, Tweets, changes to account email, and API request limits), you'll be able to try again after the time limit has elapsed.
The Tweet limit of 1,000 updates per day is further broken down into semi-hourly intervals. If you hit your account update/Tweet limit, please try again in a few hours after the limit period has elapsed.
If you've hit a follow limit, please see this Follow Limit Troubleshooting page for more information.