1) They can be recorded and will be visible on the network!
2) The spirits' actions will primarily be determined by the memories a person has of them. So if, for example, someone remembers a person as very kind and loving (because that is what they showed them, even if it wasn't true), that is also how the spirit will appear to them. If someone worries about a spirit blaming them, but there is no actual basis for this in their memories, then the spirit won't blame them.
Of course, it is optional for a spirit to speak at all. So if you'd like it to be left up in the air on what reaction the dead person would have, it is definitely possible to have them appear as a silent spectre rather than someone that can speak.
3) And yes, the spirits will only be around on the day of the actual swarm.
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2) The spirits' actions will primarily be determined by the memories a person has of them. So if, for example, someone remembers a person as very kind and loving (because that is what they showed them, even if it wasn't true), that is also how the spirit will appear to them. If someone worries about a spirit blaming them, but there is no actual basis for this in their memories, then the spirit won't blame them.
Of course, it is optional for a spirit to speak at all. So if you'd like it to be left up in the air on what reaction the dead person would have, it is definitely possible to have them appear as a silent spectre rather than someone that can speak.
3) And yes, the spirits will only be around on the day of the actual swarm.