I haven't encountered any must-echo ones yet, and I'm at the very edge of available content. However, there are things that are 10,000 times easier when you have "friends" playing the game - and they have to be friends on the social network you're using for the game. I bother muffin_song and penknife for chess games all the time :> This is one reason I'd recommend Twitter; a lot of people have EchoBazaar-only accounts, and mine is about 50% EchoBazaar.