Willful (deliberate, conscious) self-disclosure will always have an impact on the development, maintenance, and deterioration of relationships. That is the way most people are wired. The impact of those disclosures will be positive or negative depending on a variety of factors.
Self-disclosure is important to relationships which are developing. Obviously sharing one’s deepest secrets and desires (whether they are good or bad) with a virtual stranger can be off-putting, intimidating, or even frightening.