I have been using MBL for about a month now and I have my contacts up to 400+ and my community members up to 22. Considering I only have 22 community members out of 400 contacts, it seems like a bad use of time. On the other hand, it doesn't take much time to add contacts, and you still have a lot of people who don't join your community viewing your blog and possibly staying as return viewers. Your thoughts?
I always join communities that join mine. As far as the top 50 if you check their alexa score, it went up around the time they joined mybloglog so it is good for traffic. If you visit sites regularly people tend to come back to your site to see who has viewed their site.