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People assume a different attitude based on the forum they are interacting on. Each medium has acquired it own disctinct culture due to the features available on them.
Twitter has evolved into a listening forum where experts and customers talk and you follow and listen to them. If you are using twitter, it would be wise to share knowledge relevant to the target audience and try to be an expert in the area of your expertise. People do share real-time information about their status on twitter but it is limited value to your target audience, i feel. Twitter can be viewed as massmedia, since it is difficult to talk one-to-one. You may use hashtags to make it easy for others to find information, otherswise is lost and buried soon on twitter.
Facebook on the other hand is more personal since others can see pictures and facebook mimics real life connections. Facebook is also more candid and casual social media so sharing knowledge may not work. People want more light-hearted entertaining content. If you use humour, videos, picture on facebook, you are most likely to be visible and heard.