Most companies focus on attain feedback from social media accounts. Likes and comments are seen as potential feedback on a new product they might be launching. This strategy could be seen as test screening for a product. Swarovski Crystals does something similar yet they heavily rely on celebrities to endorse their product, not only that they love working with celebs on a creative level to attain an input on their products and or create a totally different product with them.
Zoƫ Kravitz collaborated with Swarovski in 2013 by launching a collection named "Swarovski Crystallized Collection". This type of association brings media attention from all kinds of outlets which can be seen as an advertisement of sorts.