Social support consists of various types of assistance that individuals receive from their social networks. In the context of the given question, all the options listed - tangible support, emotional support, and informational support - are forms of social support. The one that does not fall under social support is imitative support.
Imitative support is not a recognized type of social support. Instead, imitative support may refer to the act of mimicking someone's actions or behaviors. In the realm of social support, it is essential for individuals to receive tangible support (like financial assistance or help with tasks), emotional support (such as empathy, love, and care), and informational support (providing advice, guidance, or knowledge).
Therefore, imitative support is the option that does not belong among the forms of social support.