Has a Tweet or Facebook post ever persuaded anyone to change how they vote for president?

That's a tough question to answer, even for the top political and technical experts in social media and politics – and something of a billion-dollar question in national politics.

"It's something that may not truly be known for a few more election cycles," said Adam Sharp, the senior manager of government, news and social innovation at Twitter, speaking in Tampa along with Mitt Romney campaign's digital strategist, Zach Moffat, and the top political experts at Google Inc., and Facebook Inc.

Still, he said there are some very compelling signs that social media is making a huge impact on the overall political conversation – with interesting comparisons to traditional polls like those conducted by Gallup.

Read more at Tampa Bay Online