I think its important to also say that supporting others does not always mean having to provide concrete piratical how-to advice but quite often can mean simply saying BTDT and I wish you well.
While some members post seeking very practical hands on advice or answers to very explicit questions, more often than not, posts are simply a cry for support and help. In either case, just being reminded that you are not alone in this battle is helpful in its own right.
I have often read posts where newer members are hesitant to reply as they feel that they have little to contribute but the reality is that everyone's support is helpful.
Even if the circumstances are different and we don't have direct first hand knowledge of the issues, I think that there are commonalities in all affairs (secrecy, lies, self-deception, need for validation etc etc) which we can relate to.
And if we can relate to the other poster, we can quite often provide support, offer our help, give advice, provide assistance or just be a shoulder to lean on.
For those who hesitate offering help, please note that you could always send a PM instead of responding on the original post itself.
Wisdom from Dobler33 - People have affairs for myriad and varying reasons. Some are far sleazier than others, but the consequences are always the same - hurt, confusion, emotional trauma, the blowing apart of the foundations of your life.