Wikipedia is wonderful and infuriating in about equal measures. My contributions are infrequent and only on subjects that I know something about. I've got over the constant checking stage, I'm not a member of any Wikiprojects and don't collect Wiki-badges. What one writes is ephemeral, subject to edits both informed and profoundly ignorant, vandalised routinely both by schoolboys with nothing better to do, and by earnest types with a misplaced sense of what is appropriate. Even so I'd recommend contributing to Wikipedia if you have the time and inclination: it is often the first source to come up on Google searches and unless you're David Attenborough, what you write here is probably going to have far more influence than anything you could possibly write elsewhere.