comment on someone's entry, but change the last 3 numbers at the end of the link to get you to the comments page. you'll go to a random entry, and you can post something revelent like this:
A related post
Well Hello Livejournal! To be honest, Livejournal is not as fun without a huge audience. Facebook has really replaced everything that livejournal…
I'm amazed at how many classes I took in COllege that I don't even remember.