Nov 27, 2014 - We have updated BlogIn with the latest changes, so among other things, you can now invite many users at once by uploading a txt (each e-mail on a new line) or CSV (comma separated e-mail addresses) file that contains e-mail addresses.
Read more about this feature on our How-To blog post: How to invite large number of users (bulk invite)
As always, feel free to contact us if you have any question or comment about this update.
The BlogIn Team