The new terms, which are effective from September 29, ban any kind of scraping or crawling without “prior written consent.”

NOTE: crawling or scraping the Services in any form, for any purpose without our prior written consent is expressly prohibited.

The previous version of the terms allowed crawling in accordance with robots.txt.

“NOTE: crawling the Services is permissible if done in accordance with the provisions of the robots.txt file, however, scraping the Services without our prior consent is expressly prohibited,” it read.

In the last few months, Twitter has also altered its robots.txt file — a file that gives instructions to robot crawlers about what parts of the site they are permitted to visit — to remove instructions for all crawler bots apart from Google.

In 2015, Twitter confirmed that it had a firehose deal in place with Google to surface tweets in search results. It is not clear if the nature or terms of that deal have changed under the new management.