Very good suggestion!
And this will be effective too if some members are made into a group (without revealing who they are) and are appointed to choose the member whose blogging was the best on that day. They can choose the next day and announce.
Then everyone will show interest in answering others queries or new members questions and participate in a more involved manner.
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more...
Right now, someone who gets some pic of a LHB rake gets so many ratings and his post appears on "Popular blogs" list. But the ones who are helpful and post good posts / replies are never recognised. This is the way to do it and encourage all.