I think there is a difference of lying and sparing someone's feelings especially if its a child. You don't have to lie but you also don't have to say every thing that pops into you head either. At far as what Hellstromm brought up in the topic, ppl lie on forums because many ppl are insecure and even immature. Some pll may even use forums to role play as some one they're not.
Whether to take this to be morally wrong or if it is just using the forum as a means of entertainment is really up to each person. I personally would not be comfortable making up a false pretense to fool others and I consider it to be unnecessary. I prefer to rely solely on reason and logic and I do not like giving out details about myself.
PS: I'm not really Willypete anymore than he is Hellstromm. These are mere pseudonyms we use to interact in this medium. If you consider that, we could be accused of lying also, but it is generally understood those are not real names. So you could say too that peoples identities online are also generally understood to be questionable and should not be taken as true. On the other hand if you are making up a false certification you really should be well versed enough to back that up, or you just look stupid, dishonest, and you lose all credibility.