As stated in our site guidelines, members are permitted to promote their own outside photography-related interests and content here at mu-43, so long as it can be done in a way that benefits other members. Many times, it will be obvious where to to post a promotion. For example, if you write a review of an Olympus lens on your blog and want to share it with other members, starting a thread about your review in our Native Lenses forum would be appropriate. If you start a self promotion thread which is not specifically suited one of our specific camera, lens, or accessory forums, then it probably belongs here in the Other Promotion forum. Please note that no self promotion threads belong in Open Discussion (too busy a forum to accomodate self promotion threads) or Contests and Challenges (reserved for mu-43.com contests).