Some of my customers that do not have Facebook or Twitter accounts have found it very difficult to "join" INKSHARES.  They go onto the site and try and add an email and a password...they are then told that their password and email are not recognised (probably because they are not members) they then have to go to "forgotten password?" and click on that, pick up the link from their email and then log back in.  Obviously a customer will give up before bothering to do this.  I watched over someone trying to buy from their mobile to get them to the final buying page.  Again I think this is just a bug, I only know two people that don’t have Facebook, luckily I found out about this glitch from one of them.