I've done a large amount of the medium- and larger-sized FB groups (I don't know how many - it seems like it could be 150 but that might be an exaggeration - I try to spread them out, maybe 2 or 3 every hour as don't want to be seen by FB as a spammer; no problems so far). The ones I haven't done are generally the smaller ones and the ones where one has to request to join. Two reasons: I've been going for quantity (trying to do them quickly before getting back to work) and I'm not in their countries (sometimes, but not always, the language is not English - I've posted on around 2 dozen Spanish sites that didn't require a request to join). So if people are searching Facebook and see ones that are "request to join'", I haven't "got" them. Also, I've only done some languages which I have some knowledge of or can guess a bit from knowledge of other languages and a quick Babelfish translation of the group's aims e.g. Spanish, French, German (only did 2 - can't find more), Italian (only did 4 - can't find more; there were 2 more "ironic" ones I didn't post on), Dutch as well as English language groups. Of course, people can also contact "real" (non-FB) groups as some of their members could be E-mailed or even instructions put in the newsletter (if timing is right) or sheets handed out at a meeting (I'm in the early stages of trying to do the latter here). They might also have their own FB group also including ones I haven't posted on. And of course if the group posts a second message on their own FB page, they won't get "in trouble".