This is a prime example. It's a mixture of quotes which make the "person" sound fun-loving, with a sense of humour, links to a mixture of celebrity gossip and sexiness, and the odd link to helpful things which are basically adverts. And, frankly the celebrity gossip/sexy photos are also on horribly spammy sites which are designed to sell you things too.
I assume that there's a massive library of amusing-ish quotes which are shared between all of these bots. And that most of them are run by the same people. Or possibly franchised out to idiots who think that it will make them money.
In any case, hopefully Twitter will eventually work out a way of spotting them en masse and purge them. But I'm not holding my breath.
Original post on Dreamwidth - there are comments there.