Fusion is an enterprise 2.0 platform that aggregates portal and collaboration applications to create a centralized social business platform. It currently has a user base of 30,000 across various client projects. The document contrasts enterprise environments of the past, which were siloed and proprietary, to newer enterprise 2.0 models that are network-based, user-driven, and focus on engaging people through emergent technologies. A survey found that single sign-on is a critical feature for such platforms.