I'd say that weekly newsletters would be best - daily newsletters seem to annoy me a bit & monthly newsletters would probably have way too much info in them.
I'd also not bother to list the link codes in the newsletter, as I think most people will go to the admin & grab the link codes based on the options that they need.
ICQ seems like it'd be annoying & I think that a lot of people would close the ICQ & then possibly forget about it (where an email is sitting in their inbox & they see it every time they look at their mail)
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