"FYI Bobsy. Seychelles. West Beach Bar, North Island. Sunday. See you there 12-ish? David and Victoria send their love. Ciao. Danni"
If that's the kind of message that pops into your inbox on an average week day, chances are you're a member of one of the growing number of elite social networks designed to connect the rich, famous, powerful and/or beautiful. Sometimes all four.
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What distinguishes the following social networks from the likes of Facebook is that they're designed to be exclusive, attracting a few thousand or even a few hundred like-minded individuals.
Oh, and you usually have to be invited by a member to join or go through a rigorous approvals process. Jealous, much? We'll see. But just remember what Groucho Marx said when he telegrammed his resignation to the Friar's Club of Beverley Hills - "I don't want to belong to any club that will accept people like me as a member."
Here are 10 social networks you probably won't get to join…
One of the first and most exclusive European social networks around, consisting of 'culturally influential people who are connected by three degrees [of separation]'.
You have to be invited to join by one of its existing 55,000 members - and, even then, there's no guarantee that you'll be accepted. The management team is headed up Patrick Liotard-Vogt, who can't live without his iPhone.
One of the first social networks to cater to an elite membership, Decayenne was founded in 2001 by a trio of German entrepreneurs. Membership is usually by invitation, although you can also apply to join.
Decayenne describes itself as an 'oasis of inspiration and entertainment' for 'cosmopolitan, independent, value-driven, tolerant, liberal, non-conformists.' Not many Premier League footballers, then?
Beauty is in the eye of the beholder they say, so make sure you're scrubbed up before you submit your photo and membership application to this exclusive website. Your details will be reviewed and rated by existing 'beautifulpeople' so if you don't get in you only have your parents and genetics to blame.
Another private social network for the world's elite, brought to you by London-based concierge service Quintessentially. It's stuffed full of business opportunities, travel guides and exclusive social events for its members, of which there were said to be some 20,000 in 2007.
Like Beautifulpeople, HotEnough is a social networking /dating site for the physically attractive, and you have to go through a rigorous screening process to become a member. This includes submitting three photos of yourself, which must be approved a judging panel before your pics are put in front of other HotEnough members.
Get a score of 25 or more and you're in - although you then have to maintain a score of at least six to remain one of its 'attractive, fit and trendy singles'. No, a paper bag and a mankini will not do.
'Hey dude, wanna join my social network?', 'Radical man, that's gnarly.' Yes, Teazel is a invite-only social network for (non web) surfer types so you'll be able to enjoy lots of stimulating conversation about 'waxing your board' and 'pumping'. Teazel has members all around the world, but they're probably all called Brad.
Describes itself as the 'most definitive, comprehensive, all-encompassing yet exclusive medium through which one can perceive, understand, enjoy, appreciate and share the Luxurealism of this world.'
In other words Squ.are features lots of home-made videos from very rich people (including Hayden Panettiere), with an emphasis on fashion, fast cars and far-flung destinations. Oh, and it's invite only.
If you live in a posh condo in places like London, New York or Los Angeles you might get an invite to this community website shoved though your door. The aim is to help people in the same building to meet up, attend parties and swap gossip about each other. Get the butler to RSVP on your behalf.
You can guess from the name that this private social network isn't aimed at your average Joe Beergut. Membership of the 2,000 strong group is free, but you have to have a net worth of over $3 million (£1.94 million) or have an annual income of $300,000 (£195,000).
If you can get five existing members to recommend you, you might just scrape in as being someone of influence. Benefits include the usual high society shenanigans and a 24/7 concierge service for those times when you really, really must have a diamond tiepin in the middle of the night.
10. Angel's Circle
This VIP luxury social network is so secretive you have to email them just to find out what they do – in which case you've already failed the first test. Of course, you have to have an invitation from an existing member to join and, no, they don't accept Tesco Clubcard points.