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I disagree. When I want to enter a space, I request it. When you want to find people intrested in your topic, you can post about it or write a comment to make publicity for it. When you know a user and send him an invitation as a friend this is an other case. But to unknown users, I would consider this spam.

Well we disagree then. If someone on the street offers you a flyer you don't go to them dude I don't know you. Most people usually take it & if they accept they show up if they decline they throw out the flyer. An invite to a community is basically the same thing that's what the accept & decline buttons are for. It's not spam to get it once.