Sam Renihan has written a to-the-point, convicting PSA to would-be laptop debaters:
It is an increasing reality that many Christians, especially younger ones, are regularly engaging in debate (and occasionally discussion) through blogs, Facebook pages, forums, and other internet-based contexts. While there are many benefits to the internet, such as dissemination of otherwise unavailable materials, communicating with those who are far away, and gleaning from the wisdom, experience, and thoughts of others, there is much danger.
One of the dangers of the internet, thinking specifically of Christians and theology, is that there is little to no accountability placed on the individual in relation to his local church. Anyone can argue any point, pursue any theological trend, make any theological accusation, pick and choose any theological view, and all without the oversight of the elders to whom those individuals have professed to be in submission (assuming biblical church membership and leadership).
Would you want your elders to see the way that you have argued with other brothers and sisters on the internet? Would you read the same material and write the same arguments and speak so confidently if it were not for the anonymity and hyper-separation that the internet offers? Would you treat brothers and sisters the same way sitting with them at a lunch table during a fellowship meal at church? Are you as wonderful as you think you are?