It depends on what your blog starts off as. Like, if you're trying to start it off with your character running into slendy on accident, it would probably be best to not use something like "imbeingstalkedbyslenderman" or "creepywoodchasescene" because they may break character a touch. Make it something that would describe the character more than anything, even if the character changes over time, as it kind of gives it a feel like "oh damn, some poor blogger may / may not be facing this".