Agencies for the formation of public opinion: 

1. Print Media: Newspapers, periodicals, magazines and other print materials or press are very important agencies for the formulation of public opinion. The news items, articles, news stories, letters to the editor and several other published items on almost all the critical public issues update the individual's views and opinions. These also assimilate and concentrate varied views and opinions and help them evolve as public opinion. These media or press instruments also facilitate communication of public opinion to all concerned.

2. Electronic Media: Radio, Television, Cinema, Internet (social sites) and mobile phones have emerged as perhaps the most effective tools that contribute to the formulation of public opinion. These audio- visual modes help a great deal in assimilating views and opinions expressed even in the remotest part of the country. They help in converting views into the most representative public opinion and also in communicating it to all concerned.

3. Political Parties: Various political parties organize public meetings, demonstrations and processions to attract the attention of the people towards various problems. They educate the people to understand these problems. This helps in the formation of public opinion. 

4. Legislatures: Legislatures, Parliament and State Legislatures in our country are the most effective institutions that make substantive contributions to the formation of public opinion. The impact of their contribution has increased manifold since the beginning of the live telecast of legislative debates.

5. Educational institutions: Educational institutions organize lectures, debates and declamation skits on various problems being faced by the people and the country. Students learn about them and farm opinion on them.

It is clear from the above discussion that Electronic Media which includes Radio, Television, Cinema, Internet (Social Sites) and Mobile Phones had the most powerful impact on public opinion. Legislature also plays an important role in it but only through the Electronic media.