Here's a tip for all you graffiti "artists": when tagging public buildings, do not - I repeat - do not sign it with your online identity!
Here's a story of one Melanie Brockway, who used her MySpace profile in her graffiti:
The 23-year old single mother was tracked down by police through stickers mentioning her online identity – Devient Art – which she left by the side of her pieces.
Melanie Brockway’s page on the social networking website details her age, location and what school she attended, allowing officers to piece together her identity. [...]
Since her arrest the unemployed mother-of-two's MySpace page has been accessed, and now bears the banner heading: "Devient Art does not promote illegal graffiti in anyway. It is illegal you will get arrested, and its wrong... i again do do not promote illegal graffiti in anyway."
Her mood has also been set to “p----- off”.