-no way to moderate content. you may see this as good or bad, but spam can be annoying. it'd probably be a lot worse us it became more mainstream.
-costs due to bandwidth if you are part of the infrastructure are driven by people posting binary data, far larger in bytes vs actual text. this is apparently why there are so many paid services.
-no way to authenticate identity
I'm probably missing a couple of items. There are ways to cope with these things, people use this every day, but it's not perfect.
-no way to moderate content. you may see this as good or bad, but spam can be annoying. it'd probably be a lot worse us it became more mainstream.
-costs due to bandwidth if you are part of the infrastructure are driven by people posting binary data, far larger in bytes vs actual text. this is apparently why there are so many paid services.
-no way to authenticate identity
I'm probably missing a couple of items. There are ways to cope with these things, people use this every day, but it's not perfect.