@James

LOLZ

1)    STOP cut/ paste from MsWord b/c the Ms cwapz comes thru lolz ;-)
2)   We ourselves kinda (99%) have spam-free elgging..
3)   Spammerz on our main elgg-site get hit v-e-r-y hard within about 1- 4 hours of their spam
4)   We have blocked *whole countries when the spammer was bouncing their ip#s
5)   We have some sophisticated (non-gpl, $commerical only) utilities to track spammerz and hackerz

PS:

We  have 0.01% spam ;-)

Personally, I haven't experienced anything like this on my Elgg site yet.

But, I have the 'tracker' plugin and I have made it work for Elgg 1.6.1. May be, after 4 spams, I would block that IP.

i have add some spammers (30 ) at the begining but as i delete them very fast they don't come back 

Sometimes I wonder how it is.. that FbdKids.Com can spot a spam user within minutes of their posting funky spam on their own messageboards.. I will be working on an automatic detector for particular types of spam and yes there is an automated solution! so that we can block this as it happens for our own (biggest in the universe ~156,000 users!) FbfKids.Com.I have called this AI solutiion of mine - "Zaptor" - because it "zaps" those spam suckkerz...

akismet? =)

akismet is the best one I know ... but there isn't a plugin for elgg...or yes?

Elggenius Marcus Povey January 2010 ;-)

http://community.elgg.org/pg/plugins/marcus/read/385700/akismet

maybe it can be a core plugin if there are "Future enhancements:"

thanks for the link :-)