Its a good intention, but when one is taken down many more pop up in its place, whilst it is an opportunity for people to counter their arguments wether they then choose to believe or think on it after you have given them the truth is entirely dependent upon wether Allah wishes them to be guided or mis-guided.
Some of them genuinely dont actually know anything, and buy everything the media tells them, and all those other anti islam websites, once you explain to them in a good manner you can see that they start to become more open minded and want to understand things (very few people but one os better than none)
I think more effort should be on those websites or fb pages that when a muslim in the nicest way destroys their arguments the comments are deleted and they are blocked so the truth can no longer be spread, which clearly shows they dont care if the truth is infront of them and they will do anything to get rid of the evidence proving them to be liars and falsely accusing an entire religion based on lies & fearmongering...
its happend so many times as soon as you correct them and other people begin to ask questions amd stop insulting or when you answer their rubbish and they have nothing left except to block you lol
I think the media is the biggest culprit of anything, the attacks on jews, blacks, hispanics, now us and theres not much we can do with that apart from show people how wrong they are.
Hmm i do think more dawah to muslims needs to done, as theres a serious problem with alot of them, especially culture wise, and acting/speaking on impulse