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Of the bunch, I really like HCIC and HMPS. I haven't been to SXSW but would love to go! I'm becoming more interested in events that are not social media-specific (Mayo meeting aside, of course). As social matures, it needs to be an integrated part of your strategy. But it depends really on what you're looking for. If it's social media-specific insights and tactics, you'll get more of that at a social-specific event.
I've heard good things about Social Media Marketing World, Social Media Strategies and Social Fresh. I attend the Social Shakeup a few years ago and found it very strong. INBOUND is another one I've heard good things about. And of course, the Mayo annual conference.
Social media definitely should be a part of your crisis planning and all should be monitored. It could be a great way to channel questions proactively. For instance, you could post to your website and ask media covering the situation to direct people to your FB page. Callers could be told to go to that page for updates. For a situation like flooding in a community, I would emphasize what you are doing to respond and keep the residents safe and comfortable; e.g., I wouldn't post photos of the flooding — that's "breaking into jail," in PR-speak — but photos of the safe, warm, entertained residents would be awesome. Things to help inform and reassure families and the public, not fuel anxiety. You must also consider how each platform works in a crisis — for example, I wouldn't rely on any social platform to get the message out on its own because algorithms make things tricky in terms of reach. Depending on the goal, you may need to consider paid media support to get out a message — for example, in 2017, we were the victim of phony eclipse glasses and were trying to recall them or at laest alert folks not to use them. We included paid media as part of our response plan to demonstrate that we did all we could to reach as many people as possible. As always, it depends on your goal and each situation is different.