sqlite> select count(distinct(nick)) from twters where nick like '%.%';
count(distinct(nick)) = 5
sqlite> select distinct(nick) from twters where nick like '%.%';
nick = @marado@ciberlandia.pt
nick = eapl.me
nick = eapl.mx
nick = grumpygordie.great-site.net
nick = @chyrp.doesnm.cc