I don't see an equivalent here for the FF bookmarklet for sharing webpages. - Sean McBride

A possible substitute for Friendfeed? -- so far, I am thinking not. - Sean McBride

Requires a single domain name for the Slack account. Such as a companies email domain address and then employees with corporate email address can sign up. It sends a validation email as well to that email address. So to do this someone would need to host an email server with a domain that alias accounts can be setup that forwards to a separate real email address that they can recieve the validation email from. - CW

It has some very cool features for sharing and discussing information, but the environment is closed not open -- and the interface overall doesn't feel as intuitive and simple as FF. - Sean McBride