The Congressional Management Foundation conducted a study of the effectiveness of online town halls:
CMF conducted most of the online town hall meetings with small groups of 15-25 constituents, but one with a group of nearly 200 constituents. The sessions involved a moderator and a Member of Congress who spoke to constituents via Internet audio. The constituents posed written questions in real time during the meetings.
The sessions, conducted with a diverse group of citizens, resulted in hundreds of online questions contributing to high quality discussions about immigration and detainee policy issues. The sessions were extremely popular with constituents—96 percent said they would like to be included in similar events in the future.
State lawmakers in Washington have held many online town hall meetings in recent years, and legislators in California and Virginia have also held internet or web dialogues with citizens.
I personally feel that there's really no substitute for driving to your local Congressman's office and petitioning him in person, but I think that the online town halls aren't as bad as some make them out to be. For one thing, I'm sure that it goes a long way towards eliminating the mob mentality that we saw on display last summer. People can't get riled up the way that they would when they see their neighbor Jim-Bob get red with anger. Depending on your perspective, that's either a good thing or a bad thing. I think that a mixture of online and in-person town halls would be the best approach for our members of Congress.