Average users are not going to visit a blog to determine if they should use a service or not, or if they should use some random feature of a service or not. FF

Average users are not going to visit a blog to determine if they should use a service or not, or if they should use some random feature of a service or not. FF's blog, or any company's blog, is not their main marketing channel, mainly because the blog is not the reason people know of the site/company or visit the site. So while you're correct that 95% of the people have no idea how it is vastly different than email, the quality of the blog post as marketing material wouldn't serve to inform them anyway. If FF is serious about "marketing" this, if a new feature of this simplicity (removing the restriction on post attachments from just allowing images) even requires marketing, this most definitely isn't, and I agree, shouldn't be it. Fact is, FF provides structure to content streams that generic email and chat don't (gmail comes close to providing some structure, but it is still in the email paradigm). It's one-to-many, many-to-many, one-to-one, real-time-based and archived, and encourages succinctness in a way that neither email nor chat can be.