Bots like this are basically the backbone of the modern search-engine-driven internet! They go through the internet collecting keywords and building a 'map' of what words or phrases are used on every website on the internet.
So if I search "Masturbation Scarleteen boards" in Bing, it'll give me links to the message boards where the word "masturbation" is probably the topic, because it's in the title, or used on that page a lot... Bing only knows this because of MSNbot.
It's worth remembering that if anyone, bot or not, really wanted to they could easily copy paste any of our words onto public online forums. This is why we ask that people don't share information like: address, email address, phone number, real name on here.
Honestly though, folks doing that are not really interested in us! Instead they're copying jokes from someone else's twitter profile and reposting them.
"In between two tall mountains there's a place they call lonesome.
Don't see why they call it lonesome.
I'm never lonesome when I go there." Connie Converse - Talkin' Like You