You always have to defeat the argument or people will see it succeed and be convinced of the opposite because they've never seen any good rebuttals. There are

You always have to defeat the argument or people will see it succeed and be convinced of the opposite because they've never seen any good rebuttals. There are something like 9 lurkers for every poster and sometimes you're posting for them too. You'll never stop trolling or spam whatever you do, anyhow. For global warming, you can give a simple elevator pitch version about how we have data on a global rise in temperatures and while yes, it was really warm long ago, it's still bad for the people here now. For Obama, well, what does it even matter at this point? I don't think anyone disputes his mother being a citizen so it's pretty much whatever at this point. Regarding Facebook, well, there is a valid point that breaking the Facebook ToS probably isn't the thing we should be the most upset about, and we really do have to deal with the thousands of other companies who compiled massive databases of info whether or not they happened to break the Facebook ToS. Then point out that, yes, privacy advocates have long been against Facebook hoovering everyone's data, including when Obama was president and people are freaked out now because 'privacy violation' didn't mean much to them before but after CA, it's starting to click.