Top 10 Broadband has ranked ISPs based on number of followers, frequency of tweets, relevancy of the profile and interactivity levels.
Broadband users are now using the micro-blogging site to air their grievances with their service provider and ISPs are responding by posting up to 100 tweets a day.
Jessica McArdle, marketing manager at Top 10 Broadband, said: "Twitter is allowing broadband providers to reach out to their customer base as never before and address problems faster and more efficiently.
"Companies see the public forum of Twitter as a means of showing thousands of existing and potential customers the standard of service they can expect."
Oli White, head of marketing at fifth-placed Be Broadband, said that Twitter has become an important part of business.
White said: "The most important use of Twitter is to open another communication channel between Be and its members, which is why we’ve linked our team on Twitter directly into our customer services."
The full list:
- Virgin Media
- Post Office