Does FB cause a mountain of unsolicited e-mails or SPAM - Can I lurk - That is, check out accessible groups (Like The Boneyard) without opening up to assault. BTW: I'm assuming some "group" require you to "sign up" to said group, no?
No to the e-mails and spam (so far as I know). I get an occasional e-mail that a particular friend has posted something, very seldom, and it has something to do with how their "friend" status is set up. Not every time they post something (which is often) just a couple times a week.
I don't belong to many groups, there is a Weird Stuff in Tucson group and a group associated with that Arizona Speaker Series my wife and I subscribe to. I sometimes get a notification on my phone of posts in the Tucson group, again not often. Both required getting approved, for the speaker series to access the group at all, the Tucson group I think just to be able to post (although in 3 years I think I've posted once to the group).
Of course you can lurk. Most would say I do. I post pictures of our seasonal décor and of some jigsaw puzzles I complete, probably less than once a month. Seldom anything else. I sometimes comment on friend's posts, but rarely. Maybe once or twice a week. That's more than enough for me. I read my "newsfeed" as its called just a couple times a day (morning, late afternoon, late night, typically). Usually just to read, as I say.
And finally, I have very few "friends" by Facebook standards. 54, it tells me. This includes some family, some Rutgers basketball friends, some folks from the Church where my wife was working when she became ill, some friends of her or "us", and just a couple folks I knew in college that recently "found" me on Facebook. Also a couple former co-workers. What makes this "important" for us is that these friends are almost all not in Tucson and some have not been seen in-person for 10, 15 or (for the college folks) over 40 years. So it is cool to be in touch.