Private blog for private members with comments enabled

[Mousseline]

Could someone recommend me a site which allows me to create a private blog, invite members, who can then leave comments? I am a total novice. I opened a tumblr account which allows you to have secondary blogs which can be made private, but it looks like the comments and likes features aren't enabled.

Thanks.

Livejournal? You can have a blog entirely private if you wish, but your acquaintances will all have to create their own accounts in order to see yours, so perhaps you need to find out what service providers the people you want to engage with are already using?

Thanks Iris - I decided to stick with Tumblr in the end - it doesn't have all the features I'd like but it'll do for now, while I get myself acquainted!