http://pfpmd7dd5ijt4add2sfi4djsaij4u3ebvnwvyvuj6aeipe2f5llptkid.onion/ui2
E.g. you can hide all posts that include some offensive words.
To write your own filters, you have to know (at least to some degree) how to write regular
expressions. Also, if you're the OP of a thread, you can hide any post in it.