some people enjoys it, some people doesn't. from wikipedia:
Spamming is the use of messaging systems to send multiple unsolicited messages (spam) to large numbers of recipients for the purpose of commercial advertising, for the purpose of non-commercial proselytizing, for any prohibited purpose (especially the fraudulent purpose of phishing), or simply repeatedly sending the same message to the same user.
the keyword is unsolicited: you don't want it? just don't add it to your communities. you want it? add it to your community. it doesn't bother you at all if it's unsolicited.
I'd like to hear something about people who use both