This is a pretty interesting question and I consider that it is obligatory for a designer to participate in activity like this one at least once in his/her career If I had a design challenge, of course I would join and participate in one of the types of online communities we have been researching,because I like new things in my life and I love challenges. Of course, it depends what means ”design challenge” - If I should manage an online community or just design something about this? It is an important factor the group you work with too.
We researched mainly Facebook and YouTube and my group tried to connect them with Tumblr, Yahoo and Google+. First of all,It will depend on the product I should promote. There are various of marketing strategies that I can use too. There are products that need deeper research among the customers and their needs. As my group has the idea to connect the biggest platforms in one, I think it is really cool and will work out for my design challenge.
What is more, if you don’t try you can’t understand do you like this job or not.
I personally think that it is not a job of the designer to research and explore the client’s desires. I believe that the designer should construct and create the product, while the marketers, sales managers, brand’s managers must learn what the market need and after that the designers to make it in real. But as I said in my first sentence, at least once every designers should accept this challenge,because designers are people who are open minded.