There is certainly a lot to be said for first-mover advantage, but TradeMe specifically (while still popular) is currently fighting a losing battle. Between rising listing fees, selling fees as a percentage of the product's value, and the influx of drop-shippers that flood categories with "local" products, its days are likely numbered. Personally, while 10 years ago everyone I knew was using it, I no longer know anybody that goes to TradeMe to sell everyday items. I'm not a fan of FB, but the fact that it's monetarily free to use makes all the difference for the average user.