She wants instant gratification even though we've exchanged only a few words online.But in the modern world, in which the internet has become a vehicle for all manner of impropriety, she regards this kind of behaviour as perfectly acceptable.They are allowed to sign up for free as a way of ensuring the numbers are balanced between the sexes.

I actually moved house, to another country, partly to be nearer to her. A friend told me she got a DM from a man about sneaking into her bedroom while she was asleep and "unzipping". "I'm all up for some laughs, but that made me feel sick," she says.

Others have received messages pestering them for sex.

I once made the mistake of getting too close to a girl I knew from Twitter. She didn't like me like I liked her and it was a little bit brutal, though my own stupid fault. I've been out with other people from Twitter and while there hasn't been that spark Richard Curtis films have convinced us all exists when it doesn't - really, it doesn't - I've had fun. Some people go way too far and cross the line between cheeky and creepy.

And I mean that geographically, as well as metaphorically. Many women report being harassed by men through the site.

The idea is presumably to safeguard people from searching for their own spouses on the site - though how a husband would explain to his errant wife how he came to stumble across her picture on a website for adulterers, I don't know.

In order to fit in with the general ethos of the website I have invented a wife.

But the best bit is that you get the chance to measure your responses, to take your time over your witty replies to wow your chosen flirting partner.

You don't have to post the first thing you can think of. If you get on with someone, you might move on to flirty DMs, maybe even text messages if you're trusting enough to give out your number to an internet stranger who could turn out to be an axe murderer.

But it claims to have more than 100,000 members in the UK.

Many of them are middle-class, many have young children.

As for my own current Twitter crush, I'll be keeping that to myself.