Well this question Invite or get Traffic to your blog? is really a strange one and you can do this by many ways and hear are few tricks involved to get more visitors to your blog.
You can sign in for mylot where you can make huge number of friends and you can get more social network form that site.This where you can post discussions and your friends respond for that and you can leave a back link of your blog in the discussions you start there.
And one more site that you can trust is orkut where you can make lot of friends and you can invite them to your blog and you can even make a community and you can ask people to join the community.
And still you can find more traffic to your blog by just leaving a back link of your blog where ever you comment or post some thing in some blablabla site.