if you were planning your wedding would you:
invite aunts/uncles/cousins/family you haven't seen in over 10 years -and don't really speak to minus holiday cards?
invite people from school you have as a friend on FB but you haven't really "been friends" with them?
Invite people from work even thought you know they will not be able to make it?
invite people you've never met but are friends on facebook?
Invite a fellow blogger you've never met IRL but enjoy each other's blogging...99% of the above most likely know you're tying the know..............is it rude to not invite them?