https://itest.5ch.net/medaka/test/read.cgi/offmatrix/1186485547
2ch thread from 2007 where lucky star fans planned an irl meetup on washinomiya
They used to have hundreds of threads about the show like this one in piccrel
I think konata is shown actually using 2ch on an episode

i found an archived 2ch thread from 2007
there were more than 1000 of them during that time
the only problem is how bad google translate is lol