Here's a heat map of my week at SXSW based on Four Square data mapped to Where Do You Go.  The outliers on the map are mostly trips out to culturally significant TexMex restaurants like Guero's and Chuy's... some are a little mystifying (did I really make it up as far as 20th Street???)

eBay was donating $0.25 to charity for every FourSquare login during SXSW - I "raised" over $10 myself during the week, so this must have been a significant donation taken across all 14,000 attendees.

A month since our last celeb chart, so what’s new?

Last month I confidently predicted that Richard Bacon would soon be top five – and naturally I was wrong.  He has almost doubled his follower count, but only makes it to number six.

The story instead is of the rise of musicians, with Lily Allen and Imogen Heap both easing into the top five – replacing Russell Brand and Jonathan Ross. 

With Coldplay now massively out at the front of the pack, it seems that Twitter could be replacing MySpace as the primary way for musicians to connect with their fans. 

Finally one big new entry to the chart – Eddie Izzard rocks in with 250k followers – an unfortunate omission (although he was born in the Yemen, so possibly doesn’t count!).  With Eddie’s arrival, Rob Brydon (46k) drops off the chart for the time being.

Ashton Kutcher became the first person to top one million Twitter followers on Friday (and three days later is up to 1.23 million!), so it must be time for a quick look at our UK celebrity chart.

So what’s new.  Well Imogen Heap is new, although only because I forgot to include her – she has been on Twitter almost exactly a year and has added 100k followers in the past month, so my bad.

Neil Gaiman soars into the top three – and were it not for Stephen Fry I think we would talk a lot more about the way he uses the web.  Russell Brand is also up into the top five, now ahead of Jonathan Ross.

Finally keep an eye on Richard Bacon – at current rates of growth, he will be easing into the top five in a week or so.

As ever, please point out any errors or omissions – either comment here or tweet me on twitter.com/miketeasdale.

As I predicted a couple of weeks ago, Stephen Fry has at long last been overtaken at the top of the UK celebrity twitter chart by Coldplay.

We also have two new entries into the top five – Russell Brand eases into fourth place and Neil Gaiman has added almost 100,000 followers in a couple of weeks to get to fourth place.

Neil Gaiman is the only author in the top twenty, which is a bit of a surprise – good to see that his career has survived the dreadful job I made of editing his very first book!

Another big mover is Richard Bacon who has added 50,000 followers in the past two weeks – I set up a Twitter account a couple of days ago and he was one of the suggested people to follow, along with Al Gore, Perez Hilton and Miley Cyrus, so that might explain his sudden leap in popularity.

Bit late this week – my bad, got caught up in travelling to SXSW.  My plan is to automate this chart and leave it to run itself, watch this space :-)

Stephen Fry powering away beyond the 300k mark, but I still think that Coldplay will overtake him in a couple of weeks.  It’s also interesting to see Lily Allen now firmly in the top ten – she was of course an original poster child of Myspace, but I wonder if she is now putting more effort into Twitter.

I liked this bit of twitter verse from @RichardMadeley – read from the bottom up to make sense of this…

Friday afternoon – hoorah!!

Not much movement on the celebrity top twenty this week, so here’s a quick list of people who are bubbling under. In reverse order we have Richard Madeley (3,655), Iain Lee (5,548), Andy Murray (10,930), Graham Linehan (10,981), Jane Goldman (11,518), Phil Jupitus (12,049), Danny Wallace (14,873), Dave Gorman (15,422), Ewan McGregor (17,386) and Eddie Izzard (18,640).

I guess that I could grow the list up to a top thirty, but I can’t really be bothered!  If I get a quiet weekend, I might try to automate this – how hard can it be??

At current rates of growth, I think that Coldplay will knock Stephen Fry off the top of the charts in a couple of weeks.

We pondered a few approaches to staff blogs on the Harvest website, and in the end decided to suck an RSS feed of blog content from individual blogs and aggregate them on our site.

Of course anyone could opt out of this process if they wanted to.  In reality people have pestered us to include their blog on the site – clearly we have a company of shameless self-publicists, which I guess is what you might hope for from an marketing agency.

The result is an incredibly diverse range of staff blogs – and here are six of the best, in strictly alphabetical order, with a quick synopsis of the current obsessions:

• Gemma Bardsley (Coffee and Pie) – lost and found objects, street art
• William Corke (Digital Gallimaufry) – coffee and hookahs
• Ellie Nugent (Moodshine Crafts & Design) – knitting and shoes
• Roz Pibworth (Roz Writes) – information architecture and snowmen
• John Randle (Randle Rambles) – typography, Lomo, little people
• Dhiren Shingadia (Digital Strategy by Numetrick) – social search, twitter, web navigation

Still no sign of Richard Madeley or Maggie Philbin in spite of their first-rate twittering. Ditto Andy Murray – perhaps those rude things he said about England are coming back to haunt him.

On the chart itself, the unthinkable has happened: Coldplay has knocked Jonathan Ross into third position.  If they can sustain this rate of growth, they could be bigger than Stephen Fry, which would probably require a rewriting of the laws of physics.

[19 Feb: Go here for an updated celebrity twitter chart]

OK, I missed a few people out of my initial list – Chris Moyles apparently spent most of his breakfast show on Radio 1 talking with Andi Peters about how he has signed up to Twitter.  So some shock new entries there.

I’ve extended the list to a top fifteen, so that I can squeeze Andy Murray into it as a token sportsman (and Fearne Cotton as the only female celeb to make the list).  Dave Gorman is a useful base point – below his 5,000 followers I suspect we are well into the C-list.

By the way, whilst Chris Moyles has done a fantastic job in getting 12,300 followers over the course of the day, Stephen Fry has added a good five or six thousand followers today simply by being stuck in a lift.

PS. If you really care about this stuff, the Guardian has a much more comprehensive list of celebrity twitterers.