Do you have any scientific evidence to support your claim?
Unless it's targeted, and at least partially non-anonymous, online really aren't worth much. It's called "nonscientific polling" for a reason.

Assessing the Risks to Online Polls From Bogus Respondents
While the growth of online interviewing is a prominent trend in polling, there is variation within that trend in how researchers recruit respondents. This study finds that sourcing affects data quality.

Online opt-in polls can produce misleading results, especially for young people and Hispanic adults
We examine how an opt-in poll may have unintentionally misled the public about the sensitive issue of Holocaust denial among young Americans.

Why Online Polls Are Bunk
The weekly poll on the Web site of the Democratic National Committee asked visitors: "As the nation approaches a new millennium, what are the most...

Public opinion - Nonscientific Polling | Britannica
Public opinion - Nonscientific Polling: Straw polls and other nonscientific surveys are based on indiscriminate collections of people’s opinions, while responsible surveys are based on scientific methods of sampling, data collection, and analysis. Yet, because they are so easy to obtain, data...
