For ANYTHING. Whether it's your search, your friend, mother, brother. When you are dealing with this, it's filled with emotion and it's not always rational. Don't expect the fantasy reunion so if/when it does/doesn't happen, you won't be let down.
From my experience, adoption can be a four letter word and something that leads to various family issues. The adoptive family may be supportive, but the birth family may not want anything to do with you, or your search.