Direct Messages: 250 per day.
API Requests: 150 per hour.
Updates: 1,000 per day. The daily update limit is further broken down into smaller limits for semi-hourly intervals. Retweets are counted as updates.
Changes to Account Email: 4 per hour.
Following (daily): Please note that this is a technical account limit only, and there are additional rules prohibiting aggressive following behavior. You can find detailed page describing following limits and prohibited behavior on the Follow Limits and Best Practices Page. The technical follow limit is 1,000 per day.
Following (account-based): Once an account is following 2,000 other users, additional follow attempts are limited by account-specific ratios. The Follow Limits and Best Practices Page has more information.

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 DM Messages, Update, Changes to Account Email, and API Requests Limits), you'll be able to try again after the time has elapsed.

The Update Limit of 1,000 updates per day is further broken down into semi-hourly intervals. If you hit your account update limit, please try again in a few hours after the limit-period has elapsed.

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