I've had pretty good success giving away free accounts to my products to anybody who writes me an email asking for one. For Twiddla, there's actually a line on

I've had pretty good success giving away free accounts to my products to anybody who writes me an email asking for one. For Twiddla, there's actually a line on the pricing chart suggesting you do so if you're a teacher or student. Marginal lifetime cost for servicing an additional account is roughly $0.00, give or take a penny. Marginal benefit from a happy customer with a fresh free subscription and a Twitter account is somewhat higher. So while you can spin it as goodwill and charity, the bottom line is that it's just good business sense.