Some people are strange

Agreed Mickey there are plenty of them about, many add me but never come back nor do they ever post anything., I usually remove them after a month.

i have the same John but this is the weirdest.I noticed there were a couple more of my friends there,it's not the best way to endear you to a group of people blocking one off straight away

It is a problem often Mickey, some have had the good manners to send a message explaining why so I leave them as being in my network but not as a friend unless they are trouble makers.
Those that add others just to create a long list of contacts, there were many of that type on Multiply are certainly best blocked.

If a person invites me to be a friend I go to see what interests they have, if there are some that I also have then i will accept them, others simply get ignored.

Strange to add you then block you. Go figure...

Odd Mickey - I don't think she's come my way yet.

I often get new faces showing who has visited but most do not add me as a contact so there's no need to do anything about them. It is often users that have read my comments in one of the Staff Blogs.