This is ProBlogger’s Advice in Building Blog Buddy Relationships.
Memorize number 1- it’s first because it is IMPORTANT:

1. Make it Mutually Beneficial – these types of relationships are best when BOTH parties come out of the interaction better off. It’s a give and take thing so make sure both parties contribute and benefit in tangible ways.
2. Attempt to Find someone Within or in a Similar Niche – this won’t be possible for everyone (there are a few people blogging with quite narrow and specialized focuses) however where you can – try to build relationships with people in similar niches to you. This will open up great opportunities for you on many levels. If you can’t find someone in your niche all is not lost. You can still learn a lot from one another when you have different topics.
3. Find other bloggers on your level – when I’ve suggested this in the past I noticed a lot of bloggers approaching just successful ‘A-list’ type bloggers. While there’s nothing wrong with building a relationship with a larger blogger – there’s also something really powerful about finding another blog at a similar stage to you. This means you’ll be both going through similar challenges at the same time and can worth through them together.
4. Make Each Others Blog Better – my parting advice is to commit to make each others blogs better. While most of us are committed to making our own blogs better (and should be) something quite powerful can happen when we take that attitude with another persons blog too.”
“Synergy is the highest activity of life; it creates new untapped alternatives; it values and exploits the mental, emotional, and psychological differences between people.” – Stephen Covey

I hope someone gets the message.
PS: see the forum discussion of this task and teaching here.
Post from: Blog Tips at ProBlogger.
Find a Blog Buddy [Day 15 - 31DBBB]